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/ 让学习更有效 新课备课备考 | 英语学科
/ 让学习更有效 新课备课备考 | 英语学科
2025年鲁教版（五四学制）九年级全册英语精讲精练
Unit 1 When was it invented？
核心语法：be made of和from的区别
一、核心概念
be made of 和 be made from 都表示"由...制成"，但原材料是否发生化学变化是两者的本质区别：
短语 关键区别 记忆图示
be made of 制成品能看出原材料（物理变化） 木头 → 桌子（可见木纹）
be made from 制成品看不出原材料（化学变化） 葡萄 → 葡萄酒（形态改变）
二、用法对比详解
be made of
特点：原材料经过物理加工，仍保留原有特性
适用场景：
家具/工具制造（wood → chair）
日常用品（glass → bottle）
经典例句：
The bridge is made of steel.（钢桥可见钢材）
These shoes are made of leather.（皮鞋可见皮革纹理）
be made from
特点：原材料发生化学变化，无法辨认原貌
适用场景：
食品加工（wheat → bread）
化工产品（petroleum → plastic）
经典例句：
Paper is made from wood.（纸张看不出木材）
This cheese is made from goat's milk.（奶酪看不出牛奶）
三、特殊用法补充
be made in + 产地
This camera is made in Japan.
be made by + 制造者
The sculpture was made by a famous artist.
be made into（被制成...）
Bamboo can be made into paper.
四、易错点突破
形态变化≠化学变化（重点！）
The sweater is made from wool.（× 羊毛衫可见羊毛特性）
The sweater is made of wool.
液体/粉末类原料多用from
Flour is made from wheat.（面粉是粉末状）
现代工业的例外情况
有些塑料制品既可用of也可用from，取决于强调角度：
The bag is made of recycled plastic.（强调物理特性）
The bag is made from recycled bottles.（强调原料转化）
五、记忆口诀
"made of 看得见，物理变化形不变；
made from 认不出，化学变化质已殊；
液体粉末多用from，产地用in造者by！"
1．You must be ________ next time because you made lots of mistakes in the exam.
A．careful B．care C．careless D．carefully
2．The shirt ________ be made of silk because it feels so soft and smooth.
A．can’t B．must C．should
3．Is there ________ this weekend If not, we can go to buy a T-shirt ________ cotton (棉花).
A．going to have rain; made from
B．going to be rain; made of
C．going to be rainy; made from
4．—Sixty dollars for such a T-shirt! You ________ be joking!
—I’m serious. It’s made of silk from Hangzhou.
A．must B．need C．can
5．—Who made the paper cutting
—It ______ be Amy. None of us except her is able to do it.
A．would B．need C．must D．can
6．If success is a gate, the road ________ this gate must be made up of difficulties.
A．past B．over C．opposite D．towards
7．If success is a gate, the road to this gate _______ be made up of difficulties.
A．need B．can’t C．must D．mustn’t
8．Finally, he made a decision ________ control of his own life.
A．to be B．being in C．to be under D．to be in
9．If success is a gate, the road ________ it must be made up of difficulties.
A．towards B．against C．over D．near
10．—Can I pay the bill by check
—Sorry, but it is the rule of our restaurant that payment ________ be made in cash.
A．need B．will C．shall D．can
11．If success is a gate, the road _________ this gate must be made up of difficulties.
A．past B．through C．opposite D．towards
12．—This wall of our building is made of ________.
—That's good. So the room will be bright.
A．glass B．wood C．steel D．cotton
13．All of us are proud of the progress he's made during the past few years．We're sure he will be even ．
A．successful B．more successful
C．most successful D．successfully
14．She seldom spoke English in front of class，for she was afraid________ mistakes ____grammar.
A．to make；of B．making；of C．to be made；in D．of making；in
15．This kind of machine is made ________ America, but it can also be made ________ Chinese.
A．in; by B．by; in C．in; of D．by; for
16．Your gloves should be made ______ leather, for they feel soft and smooth.
A．in B．on C．for D．of
17．－Two hundred yuan for such a T-shirt! You ______ be joking!
－I’m not joking . It’s made of silk.
A．can’t B．can C．need D．must
18．—Jiangsu Football City League, also called “Su Chao”, _________ from May to November this year.
—Yes! It is made up of 13 city teams and is super hot now.
A．took place B．will be held C．is held D．have taken place
19．—Be careful! This door is made of ______. You may break it.
—Sorry, we’ll find another place to play soccer.
A．steel B．wood C．glass
20．Great progress ________ in the research of computers in the past twenty years.
A．will be made B．was made C．has been made D．is made
21．The good news made all of us ________.
A．happy B．to be happy C．happily D．to be happily
22．—Ya’an is ________ the City of Tea, right
—Yes, and you know, besides drinks, tea can ________ various kinds of food.
A．famous for; be made of B．famous as; be made into
C．famous for; be made from D．famous with; be made in
23．—Is there ________ this weekend If not, we can go to buy a T-shirt ________ cotton.
—Good idea.
A．going to have rain; made from
B．going to be rain; made of
C．going to rain; is made from
24．Every minute and every second should be made full ________ of ________ the finals.
A．use; to prepare B．use; to prepare for
C．use; preparing for D．used; being prepared for
25．—I think children should be made ______ some housework at home.
—I agree. They’re a member of a family.
A．doing B．to do C．do D．did
26．—Anxi is ________ the City of Tea, right
—Yes, and you know, besides drinks, tea can ________ various kinds of food.
A．famous for; be made of
B．famous as; be made into
C．famous for; be made from
D．famous with; be made in
27．—Eighty dollars for such a T-shirt! You ________ be joking!
—I'm serious. It's made of silk from Suzhou.
A．must B．can C．will D．may
28．She seldom speaks English after class, for she was afraid __ mistakes __ grammar.
A．to make; of B．making; of
C．to be made; in D．of making; in
29．Maria __shy, but now she is quite out-going. She has made lots of friends.
A．was used to be B．is used to be
C．was used to being D．used to be
30．—We all know that paper is made ________ wood.
—Yes, we can also say that wood can be made ________ paper.
A．of, from B．of, into C．from, into D．from, of
31．Is there ________ this weekend If not, we can go to buy a T- shirt ________ cotton.
A．going to have rain; made from B．going to be rain; made of
C．going to be rainy; made from D．going to be rainy; made of
32．—The chairs in the classroom ________ wood.
—Yes, they can be used for many years.
A．are made in B．are made from C．are made of
33．—Food safety is very important.
—So some rules ________ to stop people from polluting food.
A．must make B．must be made C．must made D．be made
34．— Wow, this plastic bag looks so special!
— Yes, it is. It ________ from fish!
A．made B．is made C．will be made
35．Our government has made a new law. People will_______ down many trees.
A．stop to cut B．be stopped to cut
C．be stopped from cutting D．stop from cutting
36．----What do you think of this T-shirt
----it very soft and comfortable .It must be made cotton.
A．feels ,of B．is feeling, from
C．is felt,of D．was felt, form
37．—I want to be a volunteer (志愿者) for the 19th Asia Winter Games.
—________! It will be a great experience (经历) and you can learn a lot from it.
A．So cool B．You made it C．That’s funny D．Have fun
38．Food safety is important. Rules ______ to stop people from food pollution.
A．must make B．must be made C．must made D．be made
39．—Do you know what the model planes are made of
—Waste wood from old buildings that were ________. You see, waste things can be ________ to life.
A．pull down; bring back B．pulled down; brought back
C．pull down; take away D．pulled down; taken away
40．Paper is made ________ wood, and paper can be made ________ books.
A．of; from B．of; into C．from; in D．from; into
41．Laws should be made to keep people from cutting ________ trees in order to protect our environment.
A．out B． short C． off D．down
42．— Food ______ is very important.
— So some rules ______ to stop people from polluting food.
A．safety; must make B．safety; must be made C．safe; must made
43．—I think children should ________Tik Tok(抖音) because it takes up too much time.
—I agree with you. Some rules must be made.
A．run away from B．keep away from C．separate from
44．__________ our living environment, more rules should be made to stop animals from being killed.
A．Protect B．Protecting C．Protected D．To protect
45．---What good news! Eric will be a delegate of MUN and will set off for New York next Monday.
---Yes, he made it as last. I’m sure his cultural exchange will be educational.
A．leave for B．be away from C．go on a trip to
46．Elephants will be safe ________ people stop buying things made from them.
A．because B．until C．if D．or
47．—Seventy dollars for such a dress! You ________ be joking!
—I’m serious. It’s made of silk from Hangzhou.
A．must B．need C．will D．can
48．—What’s this kind of wine made ______
— Wheat. It can also be made ______ many kinds of food.
A．from; into B．of; from C．from; of
49．---I think children should Tik Tok(抖音) because it is sometimes bad for them.
---I agree. Some rules should be made.
A．throw away B．keep away from C．separate from
50．―Food safety is very important.
―So some rules to stop people from polluting food.
A．must make B．must be made
C．must made D．be made
/ 让学习更有效 新课备课备考 | 英语学科
/ 让学习更有效 新课备课备考 | 英语学科
21世纪教育网(www.21cnjy.com)
21世纪教育网(www.21cnjy.com)
参考答案及试题解析
1．A
【解析】句意：下次你必须细心一些因为这次考试你犯的错误太多了。
考查词汇辨析。careful小心的，形容词；care关心，动词；careless粗心的，形容词；carefully小心地，副词。根据“You must be...next time because you made lots of mistakes in the exam.”可知，此处作表语，应使用形容词，这次犯了很多错误因此下次要细心些。故选A。
2．B
【解析】句意：这件衬衫一定是丝绸做的，因为它摸起来又软又滑。
考查情态动词。can’t be不可能是；must be一定是；should be应该是。根据“because it feels so soft and smooth.”可知，此处表示非常有把握的推测，must be符合。故选B。
3．B
【解析】句意：这个周末会下雨吗？如果不下雨，我们可以去买一件棉质的T恤。
考查there be句型和介词短语辨析。be made from由……制成，看不出原材料；be made of由……制成，能看出原材料。根据“Is there…this weekend ”可知，此处询问这个周末是否会下雨，句子时态为一般将来时，其结构为“There will be/There is going to be…”；根据“we can go to buy a T-shirt…cotton”可知，此处指棉质的T恤，没有经过化学变化，可以看出原材料，应用短语be made of。故选B。
4．A
【解析】句意：——这样一件T恤要60美元！你一定是在开玩笑！——我是认真的。它是由杭州的丝绸制成的。
考查情态动词辨析。must一定；need需要；can可以。根据“Sixty dollars for such a T-shirt! You…be joking!”可知，此处指“这样一件T恤要60美元，你一定是在开玩笑”，应填must“一定”。故选A。
5．C
【解析】句意：——谁做的剪纸？ ——一定是艾米做的。除了她我们没有人能做到。
考查情态动词。would会；need需要；must一定；can能。根据“None of us except her is able to do it.”可知，一定是艾米做的。故选C。
6．D
【解析】句意：如果成功是门，通向这个门的路是由困难组成的。
考查介词辨析。past超过；over在……上方；opposite在……对面；towards朝；向。the road towards/to...表示“通往……的道路”。故选D。
7．C
【解析】句意：如果成功是一扇门，那么通往这扇门的道路一定由困难组成。
考查情态动词辨析。need需要；can’t不可以；must必须，一定；mustn’t禁止。根据题干“the road to this gate ... be made up of difficulties.”可知，表示肯定推测，应用must表示。故选C。
8．D
【解析】句意：最后，他决定掌控自己的生活。
考查动词短语和介词短语。make a decision to do“决定做某事”；in control of“掌控”。故选D。
9．A
【解析】句意：如果成功是一扇门，那么通往成功的道路就必定充满困难。
考查介词辨析。towards朝，向；against反对；over在……上方；near在……附近。根据“a gate”和“the road”可知代词it指代成功的大门，因此此处应是指“朝向成功大门的道路”，应用介词towards。故选A。
10．C
【解析】句意：——我能用支票支付吗？——对不起，但是我们餐厅的规定是用现金支付。
考查情态动词。need需要；will将；shall应该；can能。根据“it is the rule of our restaurant”可知，此处应用shall，情态动词shall与第三人称连用时，表达命令或规定。故选C。
11．D
【解析】句意：如果成功是门，通向这个门的路是由困难组成的。
考查介词辨析。past超过；through穿过；opposite在……对面；towards朝；向。the road towards/to...表示“通往……的道路”。故选D。
12．A
【解析】句意：——我们建筑物的墙由玻璃制成。——那很好。所以房间看着很亮。
考查名词辨析。glass玻璃；wood木头；steel钢铁；cotton棉花。根据语境和句意，因为说房间很亮，所以应该是玻璃制成的，故选A。
13．B
【解析】句意：我们所有人都为他过去几年取得的进步感到骄傲。我们确定他会更成功的。
考查形容词比较级。A. successful成功的，形容词原级；B. more successful更成功的，形容词比较级；C. most successful最成功的，形容词最高级；D. successfully成功地，副词原级。分析句子可知，此处用在be动词后作表语，所以应填形容词，排除D；又因为前面有提示比较级的even修饰，所以应用形容词的比较级，故选B。
【点睛】选择形容词或副词比较级除了关键词than以外，还有很多修饰词。形容词比较级前可以用much，a little，any，a bit，even，far，a lot，many，rather等修饰。或者用表示倍数的词做修饰语，如表示大几倍等等。
14．D
【解析】句意：她在课堂上很少讲英语，因为她害怕语法错误。短语be afraid of doing sth…表示害怕做……；短语make mistakes in sth表示在某事中犯错误；根据题意，故选D。
15．A
【解析】句意：这种机器是美国制造的，但它也被中国人制造。
考查介词辨析。in在；by通过；of属于……的；for为了。be made in“在某地制造”，第一空指在美国制造，用in；be made by“被……制造”，第二空指被中国人制造，用by。故选A。
16．D
【解析】句意：你的手套应该是皮做的，因为它们摸起来又柔又光滑。in表示在…里；on表示在…上；for表示对于，为了;of……的；be made of…表示由…制成，故选D。
17．D
【解析】can’t不能；can能；need需要；must必须，一定。句意：200元买这样一件T恤，一定是在开玩笑吧！——我不是在开玩笑。它是丝绸做的。结合语境可知选D。
考点：情态动词辨析
18．B
【解析】句意：——江苏足球城市联赛，又称“苏超”，将于今年5月至11月举行。——是的！它由13个城市队组成，现在非常火。
考查一般将来时的被动语态。根据“Jiangsu Football City League, also called ‘Su Chao’…from May to November this year.”以及结合选项可知，此句描述将来要发生的事情，应用一般将来时，主语“Jiangsu Football City League”与动词“hold”之间是被动关系，应用一般将来时的被动语态，其结构为“will be done”。故选B。
19．C
【解析】句意：——小心！这扇门是由玻璃制成的。你可能会弄坏它。——对不起，我们会找另一处地方踢足球。
考查名词辨析。steel钢铁；wood木头；glass玻璃。根据前句警告门可能会被弄坏，可以推测材质易碎，应为glass。故选C。
20．C
【解析】句意：在过去的二十年里，计算机研究取得了很大进展。
考查现在完成时的被动语态。根据“in the past twenty years”可知，句子应用现在完成时，表示在过去的时间里已经完成的事对现在有影响，且主语“Great progress”与动词“make”之间是被动关系，故用现在完成时的被动语态，其结构为：has/have been + 过去分词。故选C。
21．A
【解析】句意：这个好消息使我们大家都很高兴。
考查形容词作宾补的用法。happy高兴的，形容词；happily高兴地，副词；to be happy高兴，不定式。由“made”可知，make sb. + 形容词：使某人……。故选A。
22．B
【解析】句意：——雅安作为茶之城而闻名，对吗？——是的，而且你知道，除了饮料，茶还可以制成各种食物。
考查形容词和动词短语。be famous for因……而著名；be famous as作为……而著名；be made of由……制造（看得出原材料）；be made from由……制造（看不出原材料）；be made into被制成；be made in在……地方制造。根据“Ya’ an is...the City of Tea”可知，雅安作为茶之城而闻名，应用be famous as；根据“tea can...various kinds of food.”可知，茶可以制成各种食物，应用be made into。故选B。
23．B
【解析】句意：这个周末会有雨吗？如果没有，我们可以去买一件棉质的T恤。
考查there be句型和动词短语。“there be”句型表示“有”，其一般将来时结构为“there is/are going to be”或“there will be”不与have连用，排除A；根据“we can go to buy a T-shirt...cotton”可知，此处应用过去分词作定语，故选B。
24．B
【解析】句意：每一分钟和每一秒钟都应该被充分利用来准备期末考试。
考查动词短语。make full use of充分利用，是固定短语，可排除D；make full use of的宾语是every minute and every second，因此第二空需要不定式作目的状语，可排除C；prepare for为……做准备，是固定短语，可排除A。故选B。
25．B
【解析】句意：——我认为应该让孩子们在家里做一些家务。——我同意。他们是一个家庭的成员。
考查非谓语动词。be made to do sth.“被要求做某事”，动词不定式作主语补足语。故选B。
26．B
【解析】句意：——安溪以茶之都而闻名，对吗？——是的，你知道，除了饮料，茶还可以制成各种食物。
考查短语辨析。be famous as作为……而出名，as后面的内容与主语是同位语，是同一人或物；be famous for因……而出名，for后面的内容与主语是不同的概念；be famous with因……而闻名，用法与be famous for相同。第一空根据后面“the City of Tea”可知，安溪与茶之都是同一概念，要用be famous as。be made of由……制成，后跟原材料，可以看出产品的原材料；be made from由……制成，后跟原材料，看不出产品的原材料；be made into被制成……，后跟制成的东西；be made in ...某地制造，后跟地点。根据“tea can ... various kinds of food”可知，茶还可以制成各种食物，要用be made into。故选B。
27．A
【解析】句意：——这样一件t恤要80美元！你一定是在开玩笑！——我是认真的。这是苏州的丝绸做的。
考查情态动词辨析。must一定，表肯定推测；can能，表能力或许可；will表意愿或请求；may可以，表允许。根据回应“Eighty dollars for such a T-shirt! ”，可知对方推测店主在开玩笑，故选A。
28．D
【解析】句意：课后她很少说英语，因为她害怕犯语法错误。
考查形容词短语及介词。be afraid to do sth害怕做某事；be afraid of（doing）sth害怕（做）某事；make mistakes犯错误；in grammar在语法方面。故选D。
29．D
【解析】试题分析：短语used to do/be过去常常做/是……,动词和be都要用原形；be used to doing表示习惯做某事；句意：Maria过去很害羞，但是现在她相当外向了，他已经教了很多朋友。结合句意，故选D
考点：考查动词短语的用法。
30．C
【解析】句意，——我们都知道纸是木头制成的。——是的。我们也可以说木头能制成纸。
考查动词短语。be made of由……制成，看得出原材料；be made from由……制成，看不出原材料；be made into被制成。根据“paper is made ... wood”可知，空一处是指纸是由木头制成的，看不出原材料，用be made from；根据“wood can be made ... paper”可知，空二处是指木头可以被制成纸，用be made into。故选C。
31．D
【解析】句意：这个周末会下雨吗？如果没有，我们可以去买一件棉质的T恤。
考查there be结构和动词短语。根据“this weekend”可知，此句用一般将来时，此句为there be结构，其将来时为there is/are going to be；rain“雨，下雨”，可作名词或动词，rainy“有雨的”，形容词，在系动词be后跟形容词作表语，第一空用going to be rainy；made of“由……制成”，从成品中能看出原料，made from“由……制成”，从成品中看不出原料；根据“a T-shirt...cotton”可知，此处是说由棉制成的T恤，从成品中能看出原料，应用made of。故选D。
32．C
【解析】句意：——教室里的椅子是木头做的。——是的，它们可以使用很多年。
考查动词短语。are made in在某地制造；are made from由……制成，看不见原材料；are made of由……制成，看得见原材料。根据“The chairs in the classroom…wood.”可知，此处是说椅子是木头做的，且看得见原材料，填are made of 。故选C。
33．B
【解析】句意：——食品安全非常重要。——因此，必须要制定一些法规来避免人们污染食物。
考查含情态动词的被动语态。根据“So some rules ... to stop people from polluting food.”可知，防止人们污染食物，一些法规必须被制定，应用含情态动词must的被动语态，结构为must be done。故选B。
34．B
【解析】句意：——哇，这个塑料袋看起来如此特别！——是的。它是用鱼做成的。
考查动词。此句描述一般的状态，用一般现在时态；句子主语it指代“this plastic bag”,塑料袋和动词make之间是被动关系，用一般现在时的被动is made。故选B。
35．C
【解析】句意：我国政府制订了一项新的法律。将会阻止人们砍伐许多树木。法律阻止人们，句子主语people是谓语动词stop的承受者，句子用被动语态，A、D是主动语态结构，排除。阻止某人做某事：stop sb. from doing sth.故选C。
36．A
【解析】试题分析：句意：你认为这T恤怎么样？它摸起来很柔软。它是由棉花制成的。根据句意及题干分析第一空feel当摸起来讲是系动词，所以没有被动，也没有进行时态；第二空能看出原材料应用be made of，故选A。
考点：考查动词及介词的用法
37．A
【解析】句意：——我想成为第19届亚洲冬季运动会的志愿者。——好酷啊！这将是一次很棒的经历，你可以从中学到很多东西。
考查情景交际。So cool好酷；You made it你成功了；That’s funny那很有趣；Have fun玩得开心。根据“It will be a great experience and you can learn a lot from it”可知，对于想成为志愿者的决定表示赞同且认为很棒，故选A。
38．B
【解析】句意：食品安全很重要。必须制定规则来阻止食品污染。
考查被动语态。主语Rules“制度，规则”是动词make“制定”动作的承受者，应用被动语态“be done”，排除选项A、C；主语是复数，时态为一般现在时，be动词应用are，排除选项D；情态动词must后跟动词原形，故选B。
39．B
【解析】句意：——你知道这个飞机模型是用什么做的吗？ ——来自拆除的旧建筑的废木材。你看，废物被重新利用。
考查被动语态和短语辨析。pull down拆毁；bring back再次使用；take away带走。that关系代词，指代“old buildings”，与“pull down”之间为被动关系；第二空中重回利用，重新焕发生机的英语表达为“bring back to life”，且“waste things”和“bring back”之前也构成被动关系。被动语态的构成为“be+过去分词”。故选B。
40．D
【解析】句意：纸是由木头制成的，纸可以制成书。
考查动词短语辨析。be made of由……制成（看得出原材料）；be made from由……制成（看不出原材料）；be made in在某地制成；be made into被制成……。根据“Paper is made...wood”可知，纸是由木头制成的，看不出原材料，用be made from。根据“and paper can be made...books”可知，纸可以被制成书，用be made into。故选D。
41．D
【解析】句意：为了保护我们的环境，应当制定法律来阻止人们砍伐树木。
考查动词短语。cut out裁剪；cut short缩短；cut off切断；cut down砍伐。根据“Laws should be made to keep people from cutting…tree in order to protect our environment.”可知，此处指的是“砍伐树木”，因此用“cut down”。故选D。
42．B
【解析】句意：—— 食品安全非常重要。—— 所以必须制定一些规则来阻止人们污染食品。
考查单词辨析和被动语态。safe安全的，形容词；safety安全，名词。根据“food”可知，是说食品安全，因此“safety”符合句意；再者根据“some rules”和“make”的关系可知，是被动关系，因此“'must be made”符合句意。故选B。
43．B
【解析】句意：——我认为孩子们应该远离抖音，因为它占用了太多的时间。——我同意你的看法。必须制定一些规则。
考查动词短语。run away from逃出；keep away from远离；separate from分离，分开，根据后面的“because it takes up too much time”可知孩子们应该远离抖音，故选B。
44．D
【解析】句意：为了保护我们的环境，应制定更多的规则来阻止动物被杀害。
考查动词不定式。protect动词原形；protecting动名词；protected动词的过去式；to protect动词不定式。此处表示目的状语，用动词不定式to protect表示“为了保护”。故选D。
45．A
【解析】句意：——多好的消息啊！埃里克将成为联合国代表，下星期一将启程前往纽约。——是的，最后他做到了。我相信他的文化交流将是有教育意义的。本题考查动词短语。A. leave for出发去（某地）；B. be away from远离；C. go on a trip to去某地旅行。结合语境“下星期一将启程前往纽约”，可知set off for启程去…，与选项中leave for出发去（某地）意思相近，故答案选A。
46．C
【解析】句意：如果人们不再购买用大象做的东西，大象就安全了。
考查连词辨析。because因为；until直到……才；if如果；or否则。根据“people stop buying things made from them.”和“Elephants will be safe”之间的关系可知，后句是前句的肯定条件，因此用if引导条件状语从句。故选C。
47．A
【解析】句意：——这样一件衣服要70美元！你一定是在开玩笑！——我是认真的。这是杭州的丝绸做的。
考查情态动词辨析。must一定；need必须；will将；can能够。根据“Seventy dollars for such a dress”可知，70美元竟然买这样一件衣服，认为对方一定是在开玩笑，故选A。
48．A
【解析】句意：——这种酒是用什么做的？——小麦。它也可以被制成许多种食物。
考查介词辨析、固定搭配。be made from 由……制成，看不出原材料；be made of 由……制成，指能看得出来是什么原材料做的；be made into被制成……，是一个被动句的动词结构，从文字的表层意思推断空格1指“酒是用什么做的”，酿酒的原材料看不见，所以用“be made from”，空格2指“被制成许多种食物”，所以用被动语态的结构“be made into”；故选A。
49．B
【解析】句意：----我认为孩子们应该远离抖音，因为这对他们来说有时是不好的。---我同意。应该制定一些规则。考查动词短语。A. throw away扔掉，丢掉；B. keep away from避开，不接近，远离；C. separate from把某物分离开来，与…分离。结合句意可知填keep away from；选B。
50．B
【解析】句意：——食品安全是非常重要的。——所以必须制定一些规则来阻止人们吃那些污染的食品。考查含有情态动词的被动语态。rules是make这一动作的承受者，故此处用情态动词的被动语态，其谓语结构是：情态动词+be+动词的过去分词。故选B。
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