新概念英语第二册课后练习答案lesson21

新概念英语第二册课后习题答案详解Lesson 21

练习答案Key to written exercises

1．关键句型练习答案

A …passing planes can be heard(1.2); The airport was built (1.2); it could not be used then(1. 3); a hundred people must have been driven away(11.4-5); this house will be knocked down by a passing plane(11.6-7); I have been offered a large sum of money(1.7)

C 1 A message will be sent immediately.

2 All these goods must be sold.

3 I told you the parcel would be received in time.

4 The letter has to be delivered by hand.

5 Your letter must have been lost In the post.

2．难点练习答案

A (sample answers)

The dog drove the sheep out of the field.

The police drove the crowds back.

I drove my car into the garage.

B1 home 2 houses 3 house 4 home

3．多项选择题答案

1. c

根据课文第3-4行Last year, however, it came into use, 只有c. came into use recently 比较接近课文的实际内容，而其他3个选择都不符课文内容。

2. d

根据课文第8行…but I am determined to stay here, 只有d. has refused to leave his house 与课文内容相符，其他3个选择都与事实不符。

3. c

只有选c. can hear 才能使这个句子同前一句Passing planes can be heard night and day 的含义相同，只是语态不同。而其他3个选择a. can heard, b. can to hear, d. can be heard 都不符合语法，在意思上都讲不通。

4. d

只有d. possible 才能使句子同前一句It couldn't be used then 意思最接近。a. able （能）需要人作主语，本句的主语是it 形式主语;b. allowed（允许）不符合题目的意思，c. impossible（不可能的）与句子意思相反。

5. a

前面句子Over a hundred people must have been driven away 中的must 表示说话人的一种主观推测。b. I’m sure(我确信) 语气比较肯定，不表示推测；c. Certain(肯定的)是形容词，缺主语和谓语，不符合语法和题目意思。；d. Of course(当然) 表示“肯定”的意思，也不够准确；只有a. I think(我想，我认为) 表示推测，所以应该选a.

6. c

只有c. are some left 才能使这个句子比较接近前一句I am one of the few people left,因为few(少数几个)同some(一些)意思比较接近, a. are none left(一个没剩)不等于the few.

b. is one left(剩下一个)也不等于the few;

d. are a lot left(剩下很多)与the few 意思相差悬殊.

所以选c.

7. b

这是一个疑问句，需要主谓倒置语序。

a. have you been offered, C. you have offered, d. they offered you 这三个选择都是陈述句语序，只有

b. have you been offered 是疑问句语序，因此选b.

8. b

只有b. give(给)出同前面的动词offered 词意思相近，而a. serve(服务，服侍)，c. take(拿，带)，d. make(做，制造) 这3个选择都与offered 意思不同。

9. a

b. number 只能修饰人，不能修饰不可数名词money,

c. some不符合语法，意思不成立；

d. piece 只能修饰不可数名词，但是不能修饰money.只有a. amount(很多，一大笔)表示金额，可以修饰money.

a large amount of很多，一大笔,表示金额，a number of是只用于可数名词

10. d

只有d. am going to 才比较接近前一句I am determined to stay here.(我决定留在这里)的含义。其他3个选择中：a. am will to 不符合语法；b. want to(想要)与be determined to 的含义有些差距；c. may (可以) 词意思更不正确。

11. c

只有c. Perhaps 才能与前一句中的…they are probably right(……他们可能是对的)意思相吻合，表示“可能”，“也许”（不肯定的推测），而a. Of course(当然)，b. It’s certain( 肯定)，d. It’s sure(一定) 这3个选择都带有肯定的意思，因此应该选c.

12. c

只有c. correct(对的，正确的)这个句子才通顺，而a. just(公正的)，b. fair(公平的)与d. equal(平等的，相等的)这3个选择都不符合题目的意思，所以选c.