4. 2009年4月至5月间，在墨西哥、美国、日本等国家爆发了甲型HIN1流感疫情．研究表明，该病是由甲型HIN1流感病毒引起的呼吸道传染病下列说法错误的是(　 )

　 A.侵入人体的甲型HlN1流感病毒可以称为抗原

　 B.将患者进行医学隔离治疗，这一措施属于控制传染源

　 C.接触公共物品后及时洗手，这一行为只能预防消化道传染病，而对预防流感这类呼吸道传染病是无效的

　 D．甲型HlN1流感具有传染性、流行性和免疫性等特点

3.右图所示的结构最可能表示的是(　 )

　 A.一对染色体　 B.一个细菌　 C.一个基因片段　 D.一个精子

2.某种新型“防盗玻璃”为多层结构，每层中间嵌有极细的金属线，当玻璃被击碎时，产生电信号，与金属线相连的警报系统就会立刻报警，这利用了金属的(　 )

　 A.延展性　 B.导电性　 C.弹性　 D.导热性

1.据报道，科学家发明了一种“月球制氧机”，这种“月球制氧机”可利用聚焦太阳能产生的高温加热月球土壤，制得氧气。据此可推测月球土壤中一定含有(　 )

　 A.氧化物　 B.氧气　 C.水　 D.氧元素

1. as　good as差不多，几乎

Don’t worry, the matter’s as good as settled. 别担心，问题差不多已经解决了。

When the car was repaired, it looked as good as new. 这辆汽车修理好的时候，看起来差不多就像新的一样。

2. as　if　／as　though　似乎；好像

He　behaved as if nothing had happened. 他装着若无其事的样子。

She treats him as though he was her own son. 她待他好像待自己的儿子一样。

另外，as if可以接一个动词不定式短语。例如：

He waved his hand to me as if to have something to tell me. 他向我挥手好像有什么要告诉我。

3. as　well　as　同(一样也)；和；还　

Joan can speak Chinese as well as English. 琼能讲英语还能讲汉语。

He spent all his money, as well as wasting his time. 他不仅浪费了时间，还花光了他所有的钱。

4. such．．．as, such　as　像……这样的

I　bought　a　lot　of　fruits,　such　as　apples,　oranges,　bananas　and　so　on. 我买了许多种水果，像苹果，桔子，香蕉等。

We had such books as you never saw. 我们有一些你从未看过的书。

5. as　for　至于某人(某事物)

We had a delightful weekend in the country. As for the traffic, we had no difficulty. 在乡下我们度过了一个愉快的周末。至于交通，我们没遇到任何困难。

6. as　to　关于某事物；提到某事物

I don't know anything as to the others. 至于其他，我一无所知。

7. so　as　to　．．．　以便,　为了

Students should take notes so as to make revision easier. 学生应当记笔记，以便容易复习。

8. as　a　matter　of　fact　其实；实际上

As　a　matter　of　fact,　I’m　very　fond　of　housework. 其实，我很喜欢做家务。

9. as　a　result　结果　(发生某种情况)

As　a　result，　he　had　been　given　an　excellent　job. 结果，他得到了一份极好的工作。

10. as　long　as　只要　

You may borrow this book as long as you promise to give it back. 只要你答应归还，你就可以把这书借走。

总之，通过以上的分析，我们对as的词性和用法有了比较全面的理解和把握，才能在实际的运用中做到心中有数，应付自如。

巩固练习

1. She had a tense expression on her face, ________she were expecting trouble.

　A. even though B. even as C. as though D. now that

2. A good many proposals were raised by the delegates, ________was to be expected.

　A. that B. what C. so D. as

3. ________might be expected, the response to the question was very mixed.　A. As B. That C. It D. What

4. Americans eat ________as they actually need every day.

A. twice as much protein B. twice protein as much

　C. twice protein as much D. protein as twice much

5. The trumpet player was certainly loud. But I wasn't bothered by his loudness ________by his lack of talent.　

A. than B. more than C. as D. so much as

6. Studies show that the things that contribute most to a sense of happiness cannot be bought, ________a good family life, friendship and work satisfaction.

　A. as for B. in view of C. in case of D. such as

7. ________he works hard, I don't mind when he finishes the experiment.　A. As soon as B. So far as C. As well as D. As long as

8. ________the danger from enemy action, people had to cope with a severe shortage of food, clothing, fuel and almost everything.

A. As long as B. As far as C. As soon as D. As well as

Key: 1-5 CDAAD 6-8 DDD

高考真题直练

1. It is generally believed that teaching is ______it is a science.

　A. an art much as　　 B. much an art as

　C. as an art much as 　D. as much an art as

2. She doesn't speak ______her friend, but her written work is excellent.

　A. as well as B. so often as C. so much as D. as good as

3. The piano in the other shop will be ______, but ______.

　A. cheaper; not as better 　　B. more cheap; not as better

　C. cheaper; not as good 　　D. more cheap; not as good

4. After supper she would sit down by the fire, sometimes for ______an hour, thinking of her young and happy days.

　A. as long as B. as soon as C. as much as D. as many as

5. With the help of the German experts, the factory produced ______ cars in 1993 as the year before.

　A. as twice many 　　　B. as many as twice

C. as twice as many 　　D. twice as many

6. After the new technique was introduced, the factory produced______ tractors in 1988 as the year before.

　A. as twice many B. as many twice C. twice as many D. twice many as

7. ______, he doesn't study well.

　A. As he is clever B. He is as clever C. Clever as he is D. As clever he is

8. ______, he was unable to make much progress.

　A. Hard as he try 　　　B. Hard as he tried

C. As he tried hard 　　D. He tried hard

9. Tom kept quiet about the accident ________ lose his job.

　A. so not as to B. so as not to C. so as to not D. not so as to

10. When a pencil is partly in a glass of water, it looks as if it ______.

　A. breaks B. has broken C. were broken D. had been broken

11. ________ is known to everybody, the moon travels round the earth once every month.

　A. It B. As C. That D. What

12. ________ is known to all, China will be an ________ and powerful country in 20 or 30 years' time.

　A. That; advancing B. This; advanced C. As; advanced D. It; advancing

13. He doesn't believe ________things ________ you do.

　A. the same; as B. the same; with C. as same; as D. as same; with

14. ________ is mentioned above, the number of the students in senior high schools is increasing.

　A. Which B. As C. That D. It

Key: 1-5 DACAD 6-10 CCBBC 11-14 BCAB

4. 表示“因某人是(某身份)”，例如：

As her private secretary he has access to all her correspondence. 他是她的私人秘书，能接触到她所有的信件。

注意1：as引导的介词短语大多用作状语，as译为"作为"，少数情况可引起宾语补足语。例如:

As a Party member, I'll take the lead in everything. (状语)

She works as a nurse. (状语)

Tom has me as one of his best friends. (引起宾语补足语)

注意2：as和like都可以作介词，但意义不同。as表示“以实际的身份或地位”。like则表示“与…相似，以与…相类似的方式”。例如：

(1). He spoke as a teacher.

(2). He spoke like a teacher.

句(1)的意思是：“他作为老师发言”或“他以老师的身份发言”。句(2)的意思是：“他讲话很像是老师”。

3. 表示“当某人是(某身份)时。例如：

As a child, she was sent to three different countries. 她儿时去过三个不同的国家。

2. 表示“作为，当作”，例如：

I found a job as a teacher. 我找了一份教师的工作。

1. 表示 “好像(某人)”，例如:

They entered the building disguised as cleaners. 他们化装成清洁工人的模样进入大楼。

2. as单独引导定语从句

as单独引导定语从句时，先行词可以是一个词，也可以是一个句子或短语。例如：

(1) She is late, as is often the case. 她迟到了，这是经常的事。(先行词是整个主句)

(2) To shut your eyes to facts, as many of you do, is foolish. 对事实视而不见--你们好多人都是如此的愚蠢。(先行词是不定式短语)

注意1：(1). 当as引导的定语从句位于具有否定意义的主句之前时，as从句所修饰的范围是整个主句的内容，也就是说，把否定意义也包括在内。例如：

As has been said above, grammar is not a set of dead rules. 正如前面所说，语法不是一套死条文。

(2). 当as引导的定语从句位于具有否定意义的主句之后时，as从句所修饰的范围不包括否定意义。例如：

Spiders are not insects, as many people think. = Spiders are not insects. But many people think they are. 许多人认为蜘蛛是昆虫，但蜘蛛并不是昆虫。

(3). 当as引导的定语从句位于具有否定意义的主句中间时，as从句所修饰的范围也不包括否定意义。例如：

She did not, as her friend had feared, open the case. 她没有打开盒子，而她的朋友就是怕她当面打开盒子。

注意2: 当修饰句子的非限制性定语从句位于句尾时，as可以用which来替代。例如：

I live a long way from work, as (which) you know. 我住得离工作单位很远，这你是知道的。

但是，当as从句位于句首或句中是，as就不能用which来替代了。例如：

As you will find out, I will never let you down. 你将会发现，我绝不会使你失望的。

Taiwan is, as you know, an inseparable part of China. 你们知道，台湾是中国不可分割的一部分。

此外，如果主句为否定句，则位于句末和句中的as从句所修饰的范围并不包括主句的否定意义，此时，as也不能用while来替代。例如：

Greenland was not a continent, as people thought. 格陵兰并不像人们所想象的那样是一个大陆。