资源简介

/ 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
2026-2027学年沪教版（五四学制）七年级英语上册核心语法精讲精练
（新教材）Unit 5 Mountains and rivers
核心语法：副词的原级比较（as...as...和not as／so...as...）
一、核心概念
副词的原级比较用于比较两个动作在方式、程度、频率等方面是否相同。其基本结构与形容词原级比较相同，但副词修饰的是动词。
核心含义：
肯定式：“和……一样……地”
否定式：“不如……”、“没有……那么……地”
示例：
Tom runs as fast as Mike.（汤姆和迈克跑得一样快。）→ 程度相等
Tom does not run as fast as Mike.（汤姆不如迈克跑得快。）→ 程度不等
与形容词原级比较的区别：
形容词原级比较修饰名词（Tom is as tall as Mike.）
副词原级比较修饰动词（Tom runs as fast as Mike.）
二、基本结构
1. 肯定式：as + 副词原级 + as
表示“A 和 B 做得一样……”。
结构： A + 动词 + as + 副词原级 + as + B
例句：
Tom runs as fast as Mike.（汤姆和迈克跑得一样快。）
She speaks English as fluently as her teacher.（她说英语和老师一样流利。）
He works as hard as his father.（他和他父亲一样努力工作。）
The car goes as fast as the train.（这辆车和火车一样快。）
注意： as...as 中间必须用副词原级，不能用比较级。
She runs as faster as her sister.
She runs as fast as her sister.
2. 否定式：not as/so + 副词原级 + as
表示“A 不如 B 做得……”。
结构： A + 动词 + not as/so + 副词原级 + as + B
例句：
Tom does not run as fast as Mike.（汤姆不如迈克跑得快。）
She does not speak English as fluently as her teacher.（她英语说得不如她老师流利。）
He does not work as hard as his father.（他不如他父亲努力工作。）
The car does not go as fast as the train.（这辆车不如火车快。）
注意： 否定句中，not as...as 和 not so...as 可以互换，但 so...as 在肯定句中不能使用。
She does not sing so well as her sister.
She sings so well as her sister.（肯定句不能用 so）
三、as...as 与 not as/so...as 的选择
情况 结构 示例
A 和 B 做得一样（程度相等） A + 动词 + as + 副 + as + B Tom runs as fast as Mike.
A 不如 B（程度不等） A + 动词 + not as/so + 副 + as + B Tom does not run as fast as Mike.
判断技巧：
两者相同 → 用 as...as
两者不同 → 用 not as/so...as
四、与形容词原级比较的对比
对比 形容词原级比较 副词原级比较
修饰对象 名词 动词
位置 be 动词后 实义动词后
示例 She is as tall as her sister. She runs as fast as her brother.
否定式 She is not as tall as her sister. She does not run as fast as her brother.
注意： 形容词原级比较用 be 动词（is/am/are），副词原级比较用 实义动词（runs, speaks, works 等）。
五、修饰语的使用
与形容词原级比较一样，副词原级比较也可以在第一个 as 前加修饰语。
修饰语 含义 示例
almost / nearly 几乎一样 She runs almost as fast as her brother.
just / exactly 正好一样 He works just as hard as his father.
half 一半 He runs half as fast as his brother.
twice / three times 两倍/三倍 She writes twice as fast as me.
六、易错点与难点突破
1. as...as 中间误用比较级
She runs as faster as her sister.
She runs as fast as her sister.
2. 形容词原级比较与副词原级比较混淆
She runs as tall as her brother.（tall 是形容词，应修饰名词）
She is as tall as her brother.（形容词修饰人）
She runs as fast as her brother.（副词修饰动词）
3. 否定句中的助动词选择
用实义动词时，否定式需要借助 do/does/did。
She runs not as fast as her sister.
She does not run as fast as her sister.
4. 比较对象不对等
She speaks English as fluently as her sister's.（不对等）
She speaks English as fluently as her sister.
七、思维导图总结
八、记忆口诀
副词原级比较口诀：
副词原级 as...as，修饰动词记心间；
肯定句中双 as 在，否定可用 so 代 as。
形容词修饰名词，副词修饰动词；
形容词在 be 后，副词在动后。
1．Our monitor can speak English ________ a native speaker does.
A．as good as B．as well as C．as better as D．as best as
2．—Does John study as ________ as his brother
—Yes, he does. Both of them are top students.
A．hard B．harder C．hardest D．the hardest
3．The red car costs ________ the blue one, but it’s more fuel efficient.
A．as much as B．as many as C．so much as D．so many as
4．He doesn’t run ________ his father.
A．as fast as B．as faster as C．so fast than D．as fast than
5．With enough daily practice, you can speak English as ________ as the foreign teacher in our school.
A．good B．well C．better D．best
6．She speaks English as ________ as her teacher, and her classmates admire her.
A．well B．good C．better D．best
7．—There is no doubt ________ Jack will win the writing competition.
—Yes. He practised writing ________ he could before the event.
A．whether; as hard as B．that; as good as C．if; as well as D．that; as often as
8．Don’t just believe the advertisement. That medicine doesn’t work ________ it says.
A．as bad as B．as well as C．as carefully as D．as good as
9．Lily practices speaking English every morning, so she can speak ________ her English teacher now.
A．as clearly as B．as clear as C．so clearly as
10．He swims as ________ as his brother. They are both good swimmers.
A．fast B．faster C．fastest D．the fastest
11．—Jim plays the guitar as ________ as his sister.
—Yes, both of them are good at it.
A．good B．well C．better
12．She speaks English ________ an American.
A．as good as B．as bad as C．as badly as D．as well as
13．He writes as ________ as his brother.
A．careful B．more careful C．carefully D．more carefully
14．I work as ________ as Emma.
A．hard B．harder C．hardest D．the hardest
15．Ella says she works as ________ as Emma.
A．hard B．harder C．hardest D．more hard
16．Steve works not as ________ as Kelly. He often makes mistakes in his writing.
A．careless B．more carefully C．carefully D．most carefully
17．I work as ________ as my sister.
A．hard B．harder C．hardest D．the hardest
18．—Does Jack swim faster than Sally
—No, he doesn’t. He swims as ________ as Sally.
A．fast B．faster C．fastest D．the fastest
19．Tom swims as ________ as Jerry. They are both fast.
A．fast B．faster C．fastest D．the fastest
20．The local winter sports company can offer Peter, a top skier from Harbin, more training chances, ________ increase his pay by 40% for his excellent performance in the city’s skiing competition.
A．as soon as B．as possible as C．as well as
21．She can sing ________ I.
A．as good as B．as better as C．as best as D．as well as
22．My sister plays the piano ________ the violin. She is really talented in music.
A．as well as B．as well C．as good as D．as better as
23．Lily draws __________ carefully __________ her deskmate. They get good grades.
A．as; as B．so; as C．as; so D．more; as
24．My brother and I are good at running. I run ________ him.
A．as faster as B．as faster than C．as fast as D．as the fastest as
25．When my cousin took part in the school show, he sang as ________ as a pop star.
A．well B．better C．the better D．the best
26．Does he work as ________ as Tina
A．hard B．harder C．hardly
27．We should try to speak English as ________ as possible in class.
A．many B．much C．more D．most
28．—Jimmy, you kept getting low marks in your tests. Maybe you don’t study ________ before.
—Sorry, Mrs Smith. I’ll be more hard-working.
A．as careful as B．so careless as C．as carelessly as D．so carefully as
29．Don’t just believe the advertisement. That medicine doesn’t work________it says.
A．as better as B．as good as C．so better as D．so well as
30．He speaks English, but not ________ his brother.
A．as good as B．as better as C．so well as D．so better as
31．Don’t just believe the advertisement. That medicine doesn’t work ________ it says.
A．as better as B．as good as C．so good as D．as well as
32．Don’t just believe the advertisement. That medicine doesn’t work ________ it says.
A．as better as B．as good as C．so well as D．so better as
33．My best friend is not ________ tall as me, but she runs ________ than most students in our class.
A．so; faster B．as; fast C．too; faster D．very; fastest
34．Ben can’t play badminton so ________ as our coach.
A．bad B．good C．well D．better
35．Tom doesn’t study _________ Peter, so Peter always gets better grades.
A．as harder as B．so hard as C．as hard so D．hard than
36．Peter doesn’t talk ________ as his younger sister Linda.
A．so gently B．as gentle C．more gently than D．gently
37．He is ________ than Mary, but he doesn’t do his homework so ________ as Mary.
A．older; carefully B．older; careful C．elder; careful
38．Daniel doesn’t paint ________ others, but his ideas are the most wonderful of all.
A．as careful as B．so carefully as C．less carefully than D．more careful than
39．The boy doesn’t work ________ the others in his class.
A．so harder as B．as hardly as C．as the hardest D．so hard as
40．He speaks English well indeed, but of course not ________ as a native speaker.
A．as fluent B．more fluent C．so fluently D．much fluently
41．I am ________ than Nancy, but I can’t jump as ________ as she does. What a shame!
A．taller; high B．taller; higher C．tall; higher D．tall; high
42．—Jack, you kept spelling the words wrong in your homework, I don’t think you study ________ before.
—Sorry, Mrs Green. I’ll work harder.
A．as careless as B．so careful as C．as carelessly as D．so carefully as
43．Don’t just believe the advertisement. That medicine doesn’t work ________ it says.
A．as better as B．as good as C．so good as D．so well as
44．He speaks English well, but of course not ________ a person born (出生) in America.
A．as clear as B．clearer than C．as clearly as
45．Linda doesn’t speak English ________ her friends, but her English writing is excellent.
A．as long as B．as good as C．as much as D．so well as
46．My brother doesn’t study _________ his classmates, so he often makes mistakes in the exams.
A．as careful as B．as carefully as C．as carelessly as D．as careless as
47．Tom runs faster than David but he doesn’t jump ________ David.
A．as high so B．so high as C．as higher as D．as higher so
48．—Sam, you kept spelling the words wrong in your homework.
—I don’t think I study ________ before.
A．as careless as B．so careful as C．as carelessly as D．so carefully as
49．The runner can’t run ________ as other runners. Maybe she is too tired.
A．as faster B．as the fastest C．so fastest D．so fast
50．Jack doesn’t work ________ his sister, Lily. He should learn from her and try his best.
A．as good as B．so great as C．so hard as
/ 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．B
【解析】句意：我们的班长说英语能和母语者说的一样好。
as good as和……一样好/几乎、简直；as well as 和……一样好/和。“as…as”意为“和……一样”，中间需用形容词或副词的原级，better和best分别为比较级和最高级，故排除；speak是实义动词，需用副词修饰，well是副词，good是形容词，应填as well as。
2．A
【解析】句意：——约翰学习得像他哥哥一样努力吗？——是的，他是。他们两个都是优等生。
根据“as...as”结构可知，中间需用形容词或副词的原级，应填hard。
3．A
【解析】句意：这辆红色汽车的价格和蓝色汽车一样，但它的燃油效率更高。
much大量（修饰不可数名词）；many大量（修饰可数名词复数）；so much as和……一样（多用于否定句）；so many as和……一样多（多用于否定句，修饰可数名词）。句中价格为不可数概念，且为肯定句，应选as much as。
4．A
【解析】句意：他跑得不如他爸爸快。
not as/so + 形容词或副词原级 + as是固定结构，表示前者不如后者，此结构中间必须使用原级；faster是比较级，than不能搭配该句型，结合语法规则，本题应选择as fast as。
5．B
【解析】句意：只要有足够的日常练习，你就能说得和我们学校的外教一样好。
good好的，形容词；well好，副词；better更好的，比较级；best最好的，最高级。as…as结构中需要使用形容词或副词的原级，排除C、D；修饰动词speak需用副词well。故选B。
6．A
【解析】句意：她英语说得和老师一样好，她的同学们都很羡慕她。
well好地；good好的；better更好的；best最好的。“as...as”中间需用形容词或副词的原级，排除 C、D项；此处修饰动词speaks，需用副词well。
7．D
【解析】句意：——毫无疑问杰克会赢得写作比赛。——是的。赛前他尽可能经常地练习写作。
There is no doubt that...是固定句型，意为“毫无疑问……”，引导同位语从句，排除A、C选项；第二空修饰动词practised需用副词，good是形容词，often是副词，as often as意为“尽可能经常”，符合语法和语境。故选D。
8．B
【解析】句意：不要轻信广告。那个药没有广告说的那么好。
as bad as和……一样差（bad是形容词）；as well as和……一样好（well是副词）；as carefully as和……一样仔细（carefully是副词）；as good as和……一样好（good是形容词）。work是实义动词，需用副词修饰。根据“Don’t just believe the advertisement”可知，药效不如广告所说的那么好，故选用as well as。
9．A
【解析】句意：莉莉每天早上练习说英语，所以她现在说得和她的英语老师一样清楚。
speak是动词，需要使用副词对它进行修饰，选用副词clearly；as...as适用于肯定句，表示“和……一样”，so...as一般用于否定句式。该句为肯定句，as clearly as满足语法与语境的双重要求。
10．A
【解析】句意：他游泳和他哥哥一样快。他们俩都是优秀的游泳运动员。
根据“as…as”固定搭配可知，中间需用形容词或副词的原级，表示“和……一样……”，故用fast。
11．B
【解析】句意：——Jim弹吉他和他姐姐一样好。——是的，他们都擅长这个。
good好的；well好；better更好的。根据“as ... as”结构可知中间用形容词或副词原级，排除C；此处修饰动词plays，需用副词well，排除A。
12．D
【解析】句意：她英语说得和一个美国人一样好。
as good as和……一样好（形容词）；as bad as和……一样差（形容词）；as badly as和……一样差（副词）；as well as和……一样好（副词）。根据“speaks English”可知，修饰实义动词应用副词，且句意表示“说得好”，应填as well as。
13．C
【解析】句意：他写得和他哥哥一样认真。
careful认真的，形容词；more careful更认真的，形容词比较级；carefully认真地，副词原级；more carefully更认真地，副词比较级。修饰动词writes需用副词，排除选项A、B；as...as 表示“和……一样”，中间用形容词或副词的原级，排除 D。C选项符合语境。
14．A
【解析】句意：我和艾玛一样努力。
as...as是同级比较结构，中间应用形容词/副词原级，hard符合题意。
15．A
【解析】句意：埃拉说她和艾玛工作一样努力。
hard努力地；harder更努力地；hardest最努力地；more hard错误形式。根据“as... as”结构可知，中间需用形容词或副词的原级，表示“和……一样”，故选hard。
16．C
【解析】句意：史蒂夫工作不像凯利那么认真。他经常在写作中犯错误。
careless形容词，粗心的；more carefully副词比较级，更细心地；carefully副词原级，细心地；most carefully副词最高级，最细心地。修饰动词works需用副词，排除A；not as…as中间用原级。应填carefully。
17．A
【解析】句意：我和我姐姐工作一样努力。
hard努力地；harder更努力；hardest最努力；the hardest最努力。根据“as...as”可知，中间用原级，as hard as表示“和……一样努力”，应填hard。
18．A
【解析】句意：——Jack游泳比Sally快吗？——不，他没有。他和Sally游得一样快。
fast快地；faster更快；fastest最快；the fastest最快。根据答句“He swims as...as Sally”可知，as...as中间用原级，as fast as表示“和……一样快”。
19．A
【解析】句意：汤姆游泳游得和杰瑞一样快。他们都很快。
fast快地；faster更快地；fastest最快地；the fastest最快地。固定搭配“as ... as”意为“和……一样”，中间接形容词或副词的原级。根据后句“They are both fast”可知两人速度相当，应用原级。
20．C
【解析】句意：当地冬季运动公司可以为来自哈尔滨的顶级滑雪运动员彼得提供更多的训练机会，而且由于他在城市滑雪比赛中的出色表现，还能将他的工资提高 40%。
as soon as 一……就……；as possible as 尽可能；as well as 也，而且。根据语境可知，公司提供“训练机会”和“涨工资”是并列的递进关系，表示除了前者还有后者，用 as well as 连接。
21．D
【解析】句意：她唱得和我一样好。
good好的，形容词；better更好的，比较级；best最好的，最高级；well好地，副词。as…as中间加形容词或副词的原级；此处修饰动词sing，应用副词well，而good是形容词，不能修饰动词，应填as well as。
22．A
【解析】句意：我妹妹既弹钢琴又拉小提琴。她在音乐方面真的很有天赋。
as well as和，以及，还有，用于连接两个或更多的事物；as well通常置于句末；as good as中good为形容词，不能修饰动词；as...as中间需用原级，better是比较级，结构错误。空缺处连接the piano和the violin两个名词，表示并列关系，应填as well as。
23．A
【解析】句意：莉莉和她同桌画得一样仔细。她们都取得了好成绩。
as...as...和……一样……（原级比较）；so...as...和……一样……（用于否定句）；as...so...错误表达；more...as...错误表达。根据“carefully”为副词原级和“They get good grades”可知，此处为同级比较肯定句，as; as符合语境。
24．C
【解析】句意：我和我哥哥都擅长跑步。我跑得和他一样快。
as...as意为“和……一样”，中间需用形容词或副词的原级。fast既是形容词也是副词，此处修饰动词run用副词原级。应填as fast as。
25．A
【解析】句意：当我的表弟参加学校演出时，他唱得和流行明星一样好。
well好地；better更好地；the better更好地；the best最好地。根据“as...as”结构可知，中间需用形容词或副词的原级，此处修饰动词sang需用副词well。
26．A
【解析】句意：他工作和蒂娜一样努力吗？
“as + 形容词/副词原级 + as”是固定结构，表示“和……一样……”。work是动词，需用副词修饰；hard表示“努力地”，是副词原级；harder是比较级，hardly表示“几乎不”，均不符合语境。因此用hard，符合句子结构和逻辑。
27．B
【解析】句意：我们应该在课堂上尽可能多说英语。
many许多；much许多；more更多；most最多。as ... as possible意为“尽可能……”，中间需用形容词或副词原级，此处修饰动词speak表示程度，应用much，构成固定短语as much as possible意为“尽可能多地”。
28．D
【解析】句意：——吉米，你考试成绩一直很低。也许你以前学习没有这么认真。——对不起，史密斯夫人。我会更加努力地。
as careful as和……一样认真；so careless as和……一样粗心；as carelessly as和……一样粗心地；so carefully as和……一样认真地。根据“I’ll be more hard-working.”可知，此处指学习没有这么认真，含否定词don’t，否定结构中通常用so…as表示比较，且修饰动词study应用副词 carefully。
29．D
【解析】句意：别只相信广告。那种药并不像广告说的那样有效。
考查原级比较结构。as...as...表示“和……一样”，用于肯定句；so...as...用于否定句，两者中间均需接形容词或副词原级。此处修饰动词“work”，需用副词；good是形容词，well是副词，故选D。
30．C
【解析】句意：他说英语，但不如他的兄弟说得好。
考查比较级结构。as good as和……一样好；as better as形式错误；so well as和……一样好，常用于否定；so better as形式错误。根据“He speaks English, but not…his brother.”可知，在否定句中常用“not as...as”或“not so...as”表示“不如……”，其中需用副词“well”修饰动词“speaks”。故选C。
31．D
【解析】句意：不要只相信广告。那种药并不像它说的那么有效。
考查词汇辨析和“not as/so...as...”结构。better更好，比较级；good好的，形容词原级；well好地，副词原级；“not as/so+形容词原级/副词原级+as...”结构意为“不像……那样……”。根据“That medicine doesn’t work...it says.”可知，此处应用“not as/so+副词原级+as...”结构，其中副词修饰动词work，所以as well as符合语境。故选D。
32．C
【解析】句意：不要仅仅相信广告，那种药并不像它所说的那样有效。
考查副词原级比较。as better as结构错误；as good as和……一样好；so well as不如……那样好；so better as结构错误。“as...as”和“so...as”中间用形容词或副词的原级，所以A选项“as better as”和D选项“so better as”结构错误，可排除；“work”在这里是动词，意为“起作用，有效”，需要用副词来修饰，“good”是形容词，“well”是副词，所以应该用“so well as”。故选C。
33．A
【解析】句意：我最好的朋友没有我高，但是她跑得比我们班大多数学生都快。
考查形容词原级和比较级的用法。faster更快，副词比较级；fast迅速地，副词原级；fastest最迅速地，副词最高级。根据“My best friend is not…tall as me”可知，此处指“我最好的朋友没有我高”，应用短语“not as/so…as”，表示“和……不一样”；根据“runs…than”可知，第二空应用副词比较级。故选A。
34．C
【解析】句意：本的羽毛球打得不如我们的教练好。
考查副词辨析。bad坏的；good好的；well好；better更好。so+形容词/副词原级+as“和……一样……”。此处使用副词修饰动词play，且此处使用原级。well好，副词。故选C。
35．B
【解析】句意：汤姆学习没有彼得努力，所以彼得的成绩总是更好。
考查副词原级的否定比较结构。not as/so+形容词或副词的原级+as为固定结构，意为“不如……”，此处not so hard as意为“不如……努力”，故选B。
36．A
【解析】句意：彼得说话不像他妹妹琳达那么温柔。
考查副词的用法和副词原级。根据“Peter doesn’t talk …as his younger sister Linda.”可知，此处修饰动词talk应用副词，排除选项B；且此处为固定结构“not so/as … as”，表示“不如……一样”，应用副词原级。故选A。
37．A
【解析】句意：他比玛丽年龄大，但是他做作业不如玛丽认真。
考查形容词比较级和副词原级。older年长的；elder年龄较大的，主要用于表示家庭成员之间的长幼关系，一般不与than连用；carefully小心地，仔细地，副词；careful仔细的，小心的，形容词。第一空，根据空后“than Mary”可知，此处是指他比玛丽年长，并不表示家庭成员之间的长幼关系，应用比较级“older”，排除C；第二空，根据“so … as Mary”可知，这里应用形容词或副词原级，又根据“do his homework”可知，这里应用副词“carefully”修饰动词“do”，在句中作状语，排除B。故选A。
38．B
【解析】句意：丹尼尔画画不如别人仔细，但他的想法是所有人中最棒的。
考查副词原级用法。as careful as和……一样仔细，形容词原级结构；so carefully as和……一样仔细，副词原级结构；less carefully than不如……仔细，副词比较级结构；more careful than比……更仔细，形容词比较级结构。句中“paint”是动词，需用副词修饰，且“doesn’t”表否定，not so+副词原级+as是固定搭配，意为“不如……”，与后半句“but his ideas are the most wonderful of all.”的转折逻辑一致。故选B。
39．D
【解析】句意：这个男孩不像班上其他人那么努力。
考查原级比较。根据“The boy doesn’t work…the others in his class.”的语境并结合选项可知，此处指这个男孩不像班上其他人那么努力，为副词原级比较的否定形式，结构为“not as/so+副词原级+as”，hard“努力地”，副词。故选D。
40．C
【解析】句意：他的英语的确讲得很好，但当然没有本地人说得流利。
考查副词原级。分析句子结构可知，此处用副词fluently，修饰动词speak；much不能修饰形容词和副词原级，所以C项符合。故选C。
41．A
【解析】句意：我比Nancy高，但是我跳的没有她高。真遗憾！
考查比较级和原级。根据“than”可知，第一空要填形容词的比较级，根据“as…as”可知，第二空要填副词原级。故选A。
42．D
【解析】句意：——杰克，你在作业中一直拼错单词，我觉得你学习没有以前认真。——对不起，格林老师。我会更加努力的。
考查原级比较和副词用法。careless粗心的；careful仔细的；carelessly粗心地；carefully认真地。根据“you kept spelling the words wrong in your homework, I don’t think you study…before.”可知，应该说“不如以前认真”，用“not as/so…as”结构，修饰动词study用副词carefully，故选D。
43．D
【解析】句意：不要只相信广告。那药不如它说的那么有效。
考查原级比较。not as/so+副词/形容词(原级)+as...表示“不如……”，所以排除选项A，根据空前work可知，此处需用副词修饰动词。故选D。
44．C
【解析】句意：他英语说得很好，但当然不如一个出生在美国的人说得清楚。
考查副词原级比较。clear清楚的；clearly清楚地。根据转折连词but可知，这里指不如一个出生在美国的人说得清楚，“not as+形容词或副词原级+as”意为“与……不一样”，此处应用修饰动词“speaks”，应用副词clearly，故选C。
45．D
【解析】句意：琳达的英语说得不如她的朋友好，但她的英语写作很棒。
考查副词的原级和副词的用法。as long as只要；as good as和……一样好；as much as差不多；not so well as不如……好。根据“Linda doesn’t speak English...her friends, but her English writing is excellent.”可知她的英语说得不如她的朋友好，此处修饰动词speak用副词well。故选D。
46．B
【解析】句意：我哥哥不像他的同学那样认真学习，所以他经常在考试中犯错误。
考查副词原级。as careful as和……一样认真的；as carefully as和……一样认真地；as carelessly as和……一样粗心地；as careless as和……一样粗心的。根据“doesn’t study”可知，此处用副词修饰动词；根据“so he often makes mistakes in the exams”可知，哥哥没有他的同学认真。故选B。
47．B
【解析】句意：汤姆跑得比David快，但他跳得不如David 高。
考查比较结构。as...as和not so/as...as之间用形容词/副词原级，排除C和D；A选项结构错误，故选B。
48．D
【解析】句意：——山姆，你在作业中一直拼错单词。——我认为我学习不像以前那么认真了。
考查原级比较。careful认真的，形容词；careless马虎的，形容词；carelessly马虎地，副词；carefully认真地，副词。修饰动词study用副词，故A与B选项错误；根据“kept spelling the words wrong in your homework”可知，学习不如以前认真了，“不如”not as/so...as，D选项符合语境。故选D。
49．D
【解析】句意：这个跑步者跑得不如其他跑步者快。也许她太累了。
考查副词原级。分析句子结构可知，此处为“not+as/so+副词原级+as”结构。故选D。
50．C
【解析】句意：杰克不像他的妹妹Lily那样努力工作。他应该向她学习并尽全力。
考查not so...as句型。as good as像……那样好；so great as像……那样强，用于否定句中；so hard as像……那样努力，用于否定句中。根据“Jack doesn’t work...his sister”可知，指的是不像妹妹那样努力工作，且此处修饰动词work用副词hard。故选C。
21世纪教育网(www.21cnjy.com)
21世纪教育网(www.21cnjy.com)

展开更多......

收起↑