资源简介 2025年八年级上册预习篇 第10天Unit1【重要词汇】friendship(n)友情【知识拓展】friend(n)朋友;friendly(adj)有好的Be friendly to……对……友好honest(adj)诚实的,正直的【知识拓展】honestly(adv)诚实地;坦率地例如:He is an honest businessman.他是一位诚实的商人。Tell me honestly,what do you think?说实话,你怎么想?【搭配】to be honest 说实话cheerful(adj)快乐的;【知识拓展】cheerfully(adv)快乐地 ;Cheerfulness(adj)阴郁的例如:He cheerfully agreed to help. 他愉快地答应帮忙。Humorous(adj)幽默的【知识拓展】humor(n)幽默【搭配】a sense of humor 幽默感caring(adj)关心的,体贴的【知识拓展】care(n/v)关心Take care of ……照顾Care for 照顾;喜欢Care about 关心,在意例如:She is a caring nature。他是一位关爱孩子的母亲。truth(n)事实【知识拓展】true(adj)真实的【搭配】to tell you the truth 说实话Joke(n)笑话【知识拓展】Tell/make a joke 讲笑话Play a joke on someone 捉弄某人lie(v/n)撒谎【知识拓展】1.撒谎:lie—lied(过去式)—lied(过去分词)—lying(现在分词)2.躺;位于:lie—lay(过去式)—lain(过去分词)—lying(现在分词)【短语搭配】tell a lie 说谎Lie down 躺下9.person(n)人【知识拓展】personal(adj)个人的【搭配】in person 亲自10.thought(n)想法【知识拓展】think(v)思考【固定搭配】have a thought 有一个想法Deep in thought 陷入沉思Think of 想到patient(adj)有耐心的【知识拓展】patience(n)耐心;impatient(adj)没耐心的Be patient with 对……有耐心Patient in doing sth 耐心做某事例如:Parents should be patient with children's mistakes.sense(n)理解;感觉【搭配】a sense of ……一种Sixth sense 第六感Make sense 有意义In a sense 在某种意义Common sense 常识height(n)身高【知识拓展】high(adj)高的【搭配】at the height of 在……鼎盛时期In height 在高度上To the height of 达到……的顶点fight(v/n)搏斗,打斗【搭配】fight against 与……对抗Fight with 与……打架Fight off 击退Get into a fight 卷人斗争dead(adj)死的【知识拓展】die(v);death(n)死亡【搭配】be dead 死亡Dead on time 准时无误Die from 死于非命Die of 死于生老病死【重要语法】形容词比较级和最高级1.构成规则-规则变化一般在形容词后加-er 构成比较级,加-est 构成最高级。例如:tall-taller-tallest;fast-faster-fastest。以不发音的e结尾的形容词,加-r或-st。例如:nice-nicer-nicest;large-larger-largest。以"辅音字母+y"结尾的形容词,先把y改为ì,再加-er 或-est。例如:happy-happier-happiest;easy easier-easiest。以重读闭音节结尾且末尾只有一个辅音字母的形容词,先双写该辅音字母,再加- er或-est。例如:big→bigger-biggest; hot-hotter-hottest。多音节形容词和部分双音节形容词,在前面加more或most。例如:beautiful----more beautiful----most beautiful不规则变化:good/well-better→best;bad/badly-worse-worst;many/much-more-most:little-less-least:far-farther/further-farthest-furthest.(二)1.can/could表示能力,意为"能,会"。例如:I can play badminton.我会打羽毛球。表示请求或允许,意为"可以"。例如:Can I borrow your book 我可以借你的书吗?should表示建议或责任,意为“应该"。例如:You should be honest with your friends.你应该对朋友诚实。3.must表示必须,意为“必须"。例如:You must finish your homework before watching TV.你必须在看电视前完成作业。表示推测,意为“一定"。例如:The book must be Lily's,because her name is on it.这本书一定是莉莉的,因为上面有她的名字。一、单项选择1.Everyone thinks Helen is ________ because she never tells lies.A.helpful B.generous C.honest D.polite2.I think table tennis is ________ sport of all in China.A.popular B.more popular C.most popular D.the most popular3.What a(n) ______ teacher! Her jokes always make everyone laugh.A.honest B.generous C.patient D.humorous4.The temperature is getting ________. We’d better wear thick coats.A.warmer and warmer B.colder and colderC.higher and higher D.lower and lower5.I think Her Story is the ________ movie of all the movies this year.A.meaningful B.more meaningful C.most meaningful D.less meaningful二、单词拼写6.She is an h girl. She never tells lies.7.Tom is an honest boy, so all his friends b what he says.8.Bob is funny, he often make us l .9.If you don’t go to hospital in time, you will get even w later on.10.It’s kind of late to start studying a language at the age of 25. H , age is never a problem if you want to learn something.三、适当形式填空11.Tom is a boy. He always makes us laugh. (fun)12.The show is not interesting at all. I felt very (bore) when I was watching it.13.Tony thinks Chinese is (easy) than math.14.My house is (big) of all the houses.15.He (believe) he will be very successful if he works really hard.四、完形填空It was my 14th birthday and I would have the biggest party ever. The number of the 16 had quickly grown from seven to seventeen. Nearly every girl in my class was 17 . When each guest (客人) excitedly 18 the invitation, I was especially happy.The 19 was full of shouts and laughter. We had just finished a game of Twister when the door bell rang. I was so 20 and I could feel my face turning red: when I 21 the door, there at the front door stood Sarah Westly—the quiet girl who sat next to me in music class—and she was holding a 22 . I thought about the guest list. How did I 23 to invite Sarah I remembered that I only added a name to the guest 24 when someone showed an interest in me. But Sarah had 25 done that. I accepted the box, a gift from Sarah, and asked her to join the party. “I can’t 26 ,”she said. “My dad’s waiting in the car.” At that moment I felt bad about forgetting to invite Sarah and really wanted her to rest for some time in my room. “Thanks, but I have to go,” she said, turning 27 towards the door. “See you Monday.”I didn’t open the box until the party was 28 . Inside the small box was a toy cat. It was the 29 gift I had received. I later 30 that the gift looked exactly like Sarah’s cat, Seymour. I didn’t know it then, but now I realize that Sarah is my best friend.16.A.boys B.guests C.books D.desks17.A.invited B.invented C.showed D.suggested18.A.made B.found C.accepted D.passed19.A.classroom B.library C.restaurant D.living room20.A.surprised B.angry C.proud D.sad21.A.saw B.opened C.caught D.closed22.A.cat B.toy C.pen D.box23.A.forget B.stop C.hope D.choose24.A.gift B.list C.diary D.box25.A.still B.even C.never D.only26.A.stand B.sing C.wait D.stay27.A.quickly B.carefully C.finally D.early28.A.ready B.successful C.over D.interesting29.A.worst B.last C.first D.best30.A.took out B.missed out C.thought out D.put out五、阅读理解ADo you have true friends Do you want to know better between you and your friends There are three different kinds of friends: “pest friends”, “guest friends”, and “best friends”.The first kind of friends is almost an acquaintance (熟人) . All you usually know about them is their names. You may meet this kind of friends at school, at work, or on the bus, but you don’t miss them when they’re not around. When this kind of friends does something bad, you don’t tell them. That is why they are called “pest friends”.The second kind of friends could also be called “social partners”. They are closer than acquaintances, but not as close as true friends. You know their names, a little of what they like or dislike, and a little of their family histories. You may have the same interest and often do something together in your free time, but you don’t talk about anything deep, such as your wishes or dreams, and they don’t open up to you how they really feel.The last kind of friends, the “best friend”, is the one you know the deepest. You’re like family members, and know everything about each other. You have no problem staying at each other’s houses, and you share your deepest feelings and thoughts. They will help you when you’re wrong. Sometimes they may not be perfect (完美的) , but at least they will always care about you, and never do anything on purpose (故意地) to hurt you.We all have our pest, guest, and best friends. We should value (重视) all friendships and remember, all best friends start out as just acquaintances.31.How many kinds of friends are there in the writer’s opinion A.One B.Two C.Three D.Four32.If you and John are neighbors and classmates, and do things together, but don’t share your feelings, you are “________”.A.pest friends B.guest friends C.best friends D.true friends33.The fourth paragraph mainly tells us ________.A.how to make a best friend B.how to learn from your best friendsC.what a best friend is D.a best friend can help you when you are wrong34.Which of the following shows the structure (结构) of the passage ①= Paragraph l ②= Para 2 ③=Para 3 ④=Para 4 ⑤=Para 5A.①/②③④⑤ B.①/②③④/⑤ C.①/②/③④⑤ D.①/②③/④/⑤第二节 根据短文内容,从所给选项中选出填入空白处的最佳选项。选项中有两项为多余选项。Friends are the ones who we walk through life together. If we share our ups and downs, and pains and joys with our friends, we will get more happiness and less sadness. 35Be friendly to others. 36 You should try to make a stranger feel at home wherever he happens to be. That is exactly the first step of making friends.Realize your fear. Some of us see meeting new people as a terrible event. We are worried about making a bad impression (印象), how to let the conversation go end and so on. Actually, all these fears are just in our head.Be yourself. 37 Just be yourself. You can meet real friends when you are who you are. The truest friendship is built with both accepting each other for who they are.38 This connection between you and the other one can only begin when your heart is open. You can’t form any new connection if you mistrust others. It’ll send the wrong information and cause them to close off their hearts to you, too.Be there for them. A friendship is a union (联盟) that supports two people. 39 When you help your friends, you should help unconditionally (无条件地). The satisfaction you get from helping others is greater than anything you can get in return.A.Be a patient friend.B.Don’t change yourself to make new friends.C.Here are some ways to make new friends.D.Open your heart.E.Don’t forget your friends’ birthday.F.Smile at others and you will be sure to get a smile in return.G.Give support to your friends as possible as you can.五、任务型阅读A Special GiftLiu Genghong must be one of the most popular influencers (网红) these days. He leads millions of people to do sports at home every day. And he always uses Jay Chou’s songs in his live studio. He and Jay are close friends. And these are their stories.When Jay was eighteen years old, he met Liu, a singer at that time. Jay had a hard time then, it was Liu who gave him food, clothes. And Liu also tried his best to help Jay on his business. One day, Jay was asked to perform in public (公众的). However, no one could understand him. Liu encouraged him and said “You did a good job, but if you can sing louder, it will be much better.” Then Liu asked for the second chance of singing for Jay.After Jay sang the second time, he got the chance to film recordings (发唱片) and became an overnight celebrity (一夜成名). Jay wanted to share his success with Liu, so he invited him to join his songs and movies.What is Jay’s special gift It’s the help from Liu Genghong. Before Jay Chou became a superstar, Liu Genghong has been helping him. Since Jay Chou became a superstar, their relationship has not been estranged (疏远的), but has become closer and closer. Their stories let us see what a true friend is. A true friend is someone who reaches for your hand and touches your heart.40.Who leads millions of people to do sports at home every day 41.Where was Jay asked to perform one day 42.When did Jay get the chance to film recordings and become an overnight celebrity 43.What is Jay’s special gift 44.What is a true friend according to the passage 六、短文填空This is my new friend, Lisa Brown. She is from England. This is her 45 (one) time to come to Chengdu. Lisa doesn’t know much Chinese, but we help each other (互相). I teach her Chinese and she 46 (teach) me English.Lisa is a good girl. She always says, “Nice 47 (meet) you!” “Please!” “Thank you!” But she is 48 (tidy). Look, this room is 49 (she). The schoolbag is on the floor (地板). The pencils, pens, rulers are on the floor, too. Her 50 (dictionary), books, and CDs are everywhere—on the desk, on the bed, in the bookcase. Look! What are 51 (that) under the bed Oh, they are two baseballs and a box of ping-pong balls. Lisa likes playing sports. It’s good for her health.Lisa loves China because she gets so many Chinese 52 (friend) help. Now she is back to England. And Lisa also wants her Chinese friends 53 (go) to England one day. It’s a good idea. What about 54 (go) to England to see Lisa next year / 让学习更有效 暑假打卡计划 | 英语学科试卷第1页,共3页试卷第1页,共3页参考答案1.C【详解】句意:每个人都认为海伦是诚实的,因为她从不撒谎。考查形容词辨析。helpful有帮助的;generous慷慨的;honest诚实的;polite礼貌的。根据“because she never tells lies.”可知,海伦是诚实的。故选C。2.D【详解】句意:我认为乒乓球是中国最受欢迎的运动。考查最高级。根据“of all”可知,是所有运动中最受欢迎的,用最高级most popular,形容词最高级前加定冠词the。故选D。3.D【详解】句意:多么幽默的老师!她的笑话总是让每个人笑。考查形容词辨析。honest诚实的;generous慷慨的;patient耐心的;humorous幽默的。根据“Her jokes always make everyone laugh.”可知,她是很幽默的,故选D。4.D【详解】句意:气温越来越低了。我们最好穿厚外套。考查比较级。warmer and warmer越来越暖和;colder and colder越来越冷;higher and higher越来越高;lower and lower越来越低。根据“The temperature is getting...We’d better wear thick coats.”可知,这里是指气温越来越低,形容气温越来越低应用lower and lower。故选D。5.C【详解】句意:我认为《她的故事》是今年所有电影中最有意义的电影。考查形容词最高级。meaningful有意义的,形容词;more meaningful比较有意义的,形容词比较级;most meaningful最有意义的,形容词最高级;less meaningful更无意义的,形容词比较级。根据“the...movie of all the movies this year.”可知,此处表达所有电影中最有意义的电影,应用最高级形式,the+最高级+比较范围。故选C。6.(h)onest【详解】句意:她是一个诚实的女孩。她从不说谎。根据“She never tells lies.”和首字母提示可知,她是个诚实的女孩,honest意为 “诚实的”,形容词作定语,符合语境。故填(h)onest。7.(b)elieve【详解】句意:汤姆是个诚实的孩子,所以他所有的朋友都相信他说的话。根据“Tom is an honest boy, ”以及首字母可知,这里应填believe,表示“相信”,句子时态是一般现在时,主语“all his friends”是复数,动词用原形。故填(b)elieve。8.(l)augh【详解】句意:鲍勃很有趣,他经常逗我们笑。根据“Bob is funny”及首字母提示可知,此处指逗我们笑,laugh表示“大笑”,make sb. do sth.表示“使某人做某事”。故填(l)augh。9.(w)orse【详解】句意:如果你不及时去医院,你以后会变得更糟。根据“If you don’t go to hospital in time, you will get even …later on.”的语境并结合首字母提示可知,此处指如果不及时去医院,情况以后会变得更糟,worse“更糟的”符合。故填(w)orse。10.(H)owever【详解】句意:25岁才开始学语言有点晚了。然而,如果你想学习一些东西,年龄从来都不是问题。后句和前句是转折关系,应用however“然而”。故填(H)owever。11.funny【详解】句意:汤姆是个有趣的男孩。他总是让我们发笑。此处修饰名词boy用形容词funny“有趣的”。故填funny。12.bored【详解】句意:这个节目一点也不有趣,我看的时候感到很无聊。根据“I felt very”可知,空处修饰人,用bored“无聊的”,作表语。故填bored。13.easier【详解】句意:托尼认为语文比数学容易。根据“is”与“than”结合提示词可知,此处应用形容词比较级形式,easy“容易的”,形容词,其比较级为easier。故填easier。14.the biggest【详解】句意:我的房子是所有房子中最大的。根据“of all the houses”可知,此处将我的房子和所有其他房子对比,需要使用最高级。故填the biggest。15.believes【详解】句意:他相信如果他真的努力工作,他会非常成功。believe“相信”,主现从不限,主句用一般现在时,主语He后动词用三单形式。故填believes。16.B 17.A 18.C 19.D 20.A 21.B 22.D 23.A 24.B 25.C 26.D 27.A 28.C 29.D 30.C【导语】本文讲述了作者在14岁生日时,在家举行了一个聚会。她没有邀请萨拉,但是萨拉给她送来了礼物,她认为那是她收到的最好的礼物。16.句意:客人的人数很快从7人增加到17人。boys男孩;guests客人;books书本;desks桌子。根据后文的“When each guest (客人) excitedly...the invitation, I was especially happy.”可知,此处指的是客人的数量,故选B。17.句意:我们班几乎每个女生都被邀请了。invited邀请;invented发明;showed展示;suggested建议。根据“When each guest (客人) excitedly...the invitation, I was especially happy.”可知,此处表示邀请班里的女生,故选A。18.句意:当每个客人兴奋地接受邀请时,我特别高兴。made制作;found找到;accepted接受;passed通过。根据“Nearly every girl in my class was...”可知,此处表示我邀请班里的女孩,因此她们接受邀请,故选C。19.句意:客厅里充满了喊声和笑声。classroom教室;library图书馆;restaurant餐厅;living room客厅。根据“It was my 14th birthday and I would have the biggest party ever.”可知,我要举行生日聚会,应在客厅里进行,故选D。20.句意:我很惊讶,我能感觉到我的脸变红了。surprised惊讶的;angry生气的;proud骄傲的;sad悲伤的。根据“We had just finished a game of Twister when the door bell rang.”可知,我们刚玩完一个游戏就有人敲门,因此感到惊讶,故选A。21.句意:当我打开门时,前门站着萨拉·韦斯特,她是一个安静的女孩,在音乐课上坐在我旁边,手里拿着一个盒子。saw看见;opened打开;caught抓住;closed关上。根据“there at the front door stood Sarah Westly”可知,要看见萨拉站在前门,应是我打开门的时候,故选B。22.句意:当我打开门时,前门站着萨拉·韦斯特,她是一个安静的女孩,在音乐课上坐在我旁边,手里拿着一个盒子。cat猫;toy玩具;pen钢笔;box盒子。根据后文的“I accepted the box, a gift from Sarah,”可知,此处表示她手里拿着一个盒子,故选D。23.句意:我怎么忘了邀请萨拉?forget忘记;stop停止;hope希望;choose选择。根据“At that moment I felt bad about forgetting to invite Sarah and really wanted her to rest for some time in my room.”可知,我忘记了邀请她,故选A。24.句意:我记得只有当有人对我感兴趣时,我才会把一个名字加到客人名单上。gift礼物;list清单;diary日记;box盒子。根据“I thought about the guest list.”可知,此处表示客人名单,故选B。25.句意:但是萨拉没有那样做。still仍然;even甚至;never从不;only仅仅。根据“I remembered that I only added a name to the guest...when someone showed an interest in me.”可知,我只会把对我感兴趣的人加入客人名单上,名单上没有萨拉,因此表示她对我不感兴趣,故选C。26.句意:她说:“我不能停留。”stand站立;sing唱歌;wait等待;stay停留。根据后文的“My dad’s waiting in the car.”可知,她爸爸在车里等她,因此她不能停留,故选D。27.句意:“谢谢,但我得走了,”她说着,迅速转身向门口走去。quickly很快地;carefully认真地;finally最后;early早地。根据“My dad’s waiting in the car.”可知,因为她爸爸在车里等她,因此她快速地走了,故选A。28.句意:直到聚会结束我才打开那个盒子。ready准备;successful成功的;over结束的;interesting有趣的。结合句意,此处表示要打开盒子,应是在聚会结束之后,故选C。29.句意:这是我收到的最好的礼物。worst最糟的;last最后的;first第一;best最好的。根据“I didn’t know it then, but now I realize that Sarah is my best friend.”可知,根据萨拉给她的礼物,她认为萨拉是她最好的朋友,因此那是她收到的最好的礼物,故选D。30.句意:后来我想,这个礼物看起来和莎拉的猫西摩一模一样。took out拿出;missed out错过;thought out仔细考虑;put out熄灭。此处接宾语从句,表示想起了她的那个礼物,故选C。31.C 32.B 33.C 34.B【导语】本文介绍三种不同类型的朋友特点。31.细节理解题。根据“There are three different kinds of friends: ’pest friends’, ’guest friends’, and ’best friends’.”可知,作者认为有三种类型的朋友。故选C。32.推理判断题。根据“They are closer than acquaintances, …You may have the same interest and often do something together in your free time, but you don’t talk about anything deep, such as your wishes or dreams, and they don’t open up to you how they really feel. ”可知,如果你们只是一起做事情但不分享感受,你们是“客人朋友”。故选B。33.主旨大意题。根据“The last kind of friends, the ’best friend’, is the one you know the deepest. You’re like family members, and know everything about each other.…”最好的朋友就像家人一样,了解彼此的一切……;可知,第四段主要讲述的是“什么是最好的朋友”。故选C。34.篇章结构题。文章第一段引出主题,第二、三、四段分别介绍三种不同类型的朋友,第五段做总结;可知选项B正确。故选B。35.C 36.F 37.B 38.D 39.G【导语】本文介绍了朋友是我们一起走过人生的人。详细地介绍了朋友的重要性和交友的方法。35.根据“Friends are the ones who we walk through life together. If we share our ups and downs, and pains and joys with our friends, we will get more happiness and less sadness.”及下文的介绍可知说的是朋友的重要性及如何交友,选项C“这里有一些结交新朋友的方法。”符合语境。故选C。36.根据“Be friendly to others.”可知说的是友好,选项F“对别人微笑,你一定会得到微笑的回报。”符合语境。故选F。37.根据“Be yourself.”可知说的是做你自己,选项B“不要为了交新朋友而改变自己。”符合语境。故选B。38.根据“This connection between you and the other one can only begin when your heart is open.”可知说的是敞开心扉,选项D“敞开心扉。”符合语境。故选D。39.根据“When you help your friends, you should help unconditionally (无条件地).”可知说的是帮助朋友,选项G“尽可能支持你的朋友。”符合语境。故选G。40.Liu Genghong. 41.In public. 42.After Jay sang the second time. 43.The help from Liu Genghong. 44.Someone who reaches for your hand and touches your heart.【导语】本文介绍了刘畊宏和周杰伦的友谊,由此说明真正的朋友是一个可以援手帮助并感动你心扉的人。40.根据“Liu Genghong ... He leads millions of people to do sports at home every day.”可知,刘畊宏每天带领成千上万的人在家里做运动。故填Liu Genghong.41.根据“One day, Jay was asked to perform in public (公众的).”可知,一天,周杰伦被要求在公众面前表演。故填In public.42.根据“After Jay sang the second time, he got the chance to film recordings (发唱片) and became an overnight celebrity (一夜成名).”可知,第二次演唱后,周杰伦得到了发唱片的机会,一夜成名。故填After Jay sang the second time.43.根据“What is Jay’s special gift It’s the help from Liu Genghong.”可知,刘畊宏的帮助对于周杰伦而言是特殊的礼物。故填The help from Liu Genghong.44.根据“Their stories let us see what a true friend is. A true friend is someone who reaches for your hand and touches your heart.”可知,真正的朋友是一个可以援手帮助并感动你心扉的人。故填Someone who reaches for your hand and touches your heart.45.first 46.teaches 47.to meet 48.untidy 49.hers 50.dictionaries 51.those 52.friends’ 53.to go 54.going【导语】本文介绍了作者的新朋友丽莎,她来自英国,第一次来成都。作者教她中文,她教作者英文。丽莎很有礼貌,但不太爱整洁。她喜欢中国,因为得到了很多中国朋友的帮助,也希望中国朋友能去英国。45.句意:这是她第一次来成都。根据“This is her…time to come to Chengdu.”可知,此处表示“第一次”,应用序数词first,故填first。46.句意:我教她中文,她教我英文。根据“I teach her Chinese and she…”可知,此处时态应与前半句一致,用一般现在时,主语是she,谓语动词用第三人称单数形式teaches,故填teaches。47.句意:很高兴见到你!根据“Nice…you!”可知,此处是固定句型Nice to meet you!“很高兴见到你”,故填to meet。48.句意:但是她不爱整洁。根据“Look, this room is...The schoolbag is on the floor (地板), the pencils, pens, rulers are on the floor, too.”可知,房间很乱,所以她不爱整洁,untidy表示“不整洁的”,故填untidy。49.句意:看,这个房间是她的。根据“this room is...”可知,此处表示“她的房间”,应用名词性物主代词hers,相当于her room,故填hers。50.句意:她的字典、书和光盘到处都是——在桌子上、床上、书柜里。根据“Her...books, and CDs are everywhere”可知,此处dictionary应用复数形式dictionaries,故填dictionaries。51.句意:看!床底下那些是什么?根据“What are…under the bed ”可知,此处that应用复数形式those,故填those。52.句意:丽莎喜欢中国,因为她得到了许多中国朋友的帮助。根据“she gets so many Chinese…help”可知,此处表示“朋友的帮助”,应用名词所有格形式friends’,故填friends’。53.句意:丽莎也希望她的中国朋友有一天能去英国。根据“wants her Chinese friends…to England one day”可知,want sb. to do sth.表示“想要某人做某事”,故填to go。54.句意:明年去英国看丽莎怎么样?根据“What about…to England to see Lisa next year ”可知,about是介词,后接动名词going,故填going。答案第1页,共2页答案第1页,共2页 展开更多...... 收起↑ 资源预览