6.　　　　　 不是基因工程方法生产的药物是　　　　　　　　　　　　　　　　　

A.干扰素　　　　　 B.白细胞介素　　　 C.青霉素　　　　　　 D.乙肝疫苗

5.　　　　　 基因工程是在DNA分子水平上进行设计施工的。在基因操作的基本步骤中，不进行碱基互补配对的是　　　　　　　　　　　　　　　　　　　　　　　　　　　

A.人工合成目的基因　　　　　　　　　 B.目的基因与运载体结合

C.将目的基因导入受体细胞　　　　　　 D.目的基因的检测表达

4.　　　　　 下列哪项不是基因工程中经常使用的用来运载目的基因的载体　　　　

A.细菌质粒　　　 B.噬菌体　　 C.动植物病毒　　 D.细菌核区的DNA

3.　　　　　 有关基因工程的叙述正确的是　　　　　　　　　　　　　　　　　　

A.限制酶只在获得目的基因时才用　　　 B.重组质粒的形成是在细胞内完成的

C.质粒都可作为载体　　　　 　　　　 D.蛋白质的结构成分为合成目的基因提供资料

2.　　　　　 基因工程常用的受体有　　　　　　　　　　　　　　　　　　　　　

①大肠杆菌　　　 ②枯草杆菌　　　 ③结核杆菌　　　 ④动植物细胞

A.①②③④　　　　 B.①②③　　　　　 C.②③④　　　　　 D.①②④

1.　　　　　 在基因工程中，切割载体和含有目的基因的DNA片段中，一般需使用　　　

A.同种限制酶　　　 B.两种限制酶　　 C.同种连接酶　　　 D.两种连接酶

第二节：写作(满分30分)

假定你是李华，[)avid是你的美国笔友。他购物袋很感兴趣，来

信向你询问此事。请你给他写封回信。主要内容如下：

　 ◇感谢他的关注。

　 ◇简要介绍相关情况。

　 ◇表明你自己的态度。

　 注意：

　 1．词数120-150。信的格式已为你写好。

　 2．可根据内容要点适当增加细节，以使行文连贯。

　 参考词汇：环保购物袋一environment-friendly shopping bag；关注一concern

*******************

Dear David。

　　　　　　　　　　　　　　　　　　　　　　　　　　　　　 　　　　　　　　　　

　

　　　　　　　　　　　　　　　　　　　　　　　　　　　　　　　　　　　　　　

　

　　　　　　　　　　　　　　　　　　　　　　　　　　　　　　　　　　　　　　　

　

　　　　　　　　　　　　　　　　　　　　　　　　　　　　　　　　　　　　　 　　　

　

　　　　　　　　　　　　　　　　　　　　　　　　　　　　　　　　　　　　　　　　

　

　　　　　　　　　　　　　　　　　　　　　　　　　　　　　　　　　　　　　　　　

　　　　　　　　　　　　　　　　　　　　　　　　　　　　　　　　　　　 Yours

　　　 　　　　　　　　　　　　　　　　　　　　　　　　　　　　　　　　Li　 Hua

　　 0ne possible version：

Dear David，

　　 I’m glad that you've noticed our efforts directed towards environmental protection．

Thank you for your concern．

　　 As you know，plastics never rots．Too much use of plastic bags has caused serious

　White pollution in China .So our governmet encourages　 us to use environment-friendly

　shopping bags．These bags are made of a variety of material that can be easily treated

　when they become rubbish．Besides，they can be reused．More and more people in Chi

　na have realized the advantages of such bags and started using them．However，there

are still people who find it inconvenient to use these bags and prefer to use plastic ones．

　 I believe that the wide use of these shopping bags can greatly improve our environ-

ment．1 would never use plastic shopping bags again and will try to persuade others to

do SO．

　　　　　　　　　　　　　　　　　　　　　　　　　　　　　　　　 Yours，

　　　　　　　　　　　　　 　　　　　　　　　　　　　　　　　　　　LiHHa

　 　附：听力录音原文

(Text l)

W：The book you want is Out．It is very much in demand．

M：Oh，I’m sorry to hear that．But can you keep it for me when it is back?

W：1will．

(Text 2)

W：Looks like it’s going to be a nice day．

M：Yes，it’S about time．Spring is just around the corner．

(Text 3)

M：I’m sorry that Jim got the job instead of you．

W：I have no hard feelings toward him；I know that he had stronger qualifications．

(Text 4)

M：Oh，that’s a nice dress you’re wearing．

W：Thank you．My father gave it to me as a birthday present．He knows red is my fa-

　　 vorite color．

(Text 5)

W：Did you go to the football match last Sunday?

M：Oh，yes．It was supposed to start at 2：30，but it was delayed fifteen minutes．

(Text 6)

M：Sylvia，what languages do you speak?

W：As you know，Korean is my first language．I also speak English and sollle Chinese．

　 How about you?

M：English ,German and　 French. While I was studying　 in Europe ,I used　 French and

　　 German all the time . Now my French is rusty ,but I do keep my German　 up.

W：How do you practies your German ?

M：Oh,the mans who lines next door-Ican him Heinz -is from Berlin ,He and are always

　 talking about Germany.

W：Well,all you need now is a neighbor from Paris!

(Text 7)[

M：Hi，Viola．Anybody sitting here?

W：Oh，hi，Tyler．No，have a seat．Looks like the whole dorm came to lunch todav．

　　 doesn’t it?

M：Yeah，it does; it's crowded．They must have bused some of them in! Hey，in class

　 today I heard you say that you have a big family．　　 一

W：That’s right．1’ve got six brothers and five sisters．

M：Wow! That is pretty big! Are you the oldest’

W：No．Actually，I’m the second oldest．

M：That’s got to be a lot of work．What do your parents do?

W：Well，my father drives a cab．He works Out at the airport at night．

M：What about your mother?

W：My mother runs a small family store．

M：What kind of store is it?

W：Oh，we mostly sell food--bread，eggs，milk，rice，that sort 0f thing．

M：I guess a food store like that would come in handy if you had a Iarge family．

(Text 8)

W：Hello，Steve?

M：Hi，Stella．What’sgoing on?

W：Oh，my car’s having problems again，but I don’t have the time or money to get it

　 fixed．

M：Is it really bad?

　M：Is this your first time riding the train tO Chicago?

W：No，this is my second time，but I don’t remember much．　 I came with my parents

　　 When I was 3．

M：Well，I'd suggest changing seats．The view’s much better over on that side of Iht

　　 train．

W：Thank you，I’II do that．

M：And hold on to your ticket．You might be asked for it again．Have a nice trip．

W：Thanks for your help．Maybe I’11 see you again when I come back．

(Text 10)

W：Well，Mr．Smith，we have had an interesting discussion about your work．Now．

　 tell US something about your after-work activities．

M:I guess not much different from everyone else．I’m interested in sport，and I run a-

　 bout 3 miles every day．I particularly enjoy cross-country running．While I’m run-

　 ning，I think about all sorts of things，and at the end of a run I’m sometimes sur-

　 prised tO find that I’ve managed to solve a problem that was On my mind．As a mat-

　 ter of fact，I’In interested in climbing as well as running．I’II never become an ex-

　 pert climber，but I know what I’ITS doing in the mountains．I successfully completed

　 a course in snow and ice climbing when 1 was younger，and I’ve done a series of eas-

　 y climbs in the Alps during the last few years．

W：You certainly seem to enjoy various types of recreation．'All right，Mr．Smith．

　 Thanks for your interesting talk．