2.用X射线处理蚕蛹，使其第2号染色体上的斑纹基因移位于决定雌性的W染色体上，使雌体都有斑纹。再将雌蚕与白体雄蚕交配，其后代凡是雌蚕都有斑纹，凡是雄蚕都无斑纹。这样有利于去雌留雄，提高蚕丝的质量。这种育种方法所依据的原理是　　　　　　　

(　)(

A.染色体结构的变异 　　　　　　　　B.染色体数目的变异

C.基因突变　 　　　　　　　　　　　　D.基因重组

解析：由于题中涉及的育种方法是实现基因的位置改变，应属于染色体结构变异。

答案：A

1.(2010·潍坊模拟)下面关于染色体组、单倍体和二倍体的叙述中不正确的是　　 (　)

A.一个染色体组中不含同源染色体

B.由受精卵发育的个体，体细胞含有两个染色体组的叫二倍体

C.含一个染色体组的个体是单倍体，单倍体不一定含一个染色体组

D.人工诱导多倍体惟一的方法是用秋水仙素处理萌发的种子或幼苗

解析：人工诱导多倍体方法有：①用一定浓度的秋水仙素处理萌发的种子或幼苗；②骤然降低培养温度，诱导植物体产生多倍体。

答案：D

When I was a college student，I did a lot of traveling abroad.That was because a professor __1__ me to do so.She said, “Now is the time for you to travel around the world，__2__ your knowledge through actual experiences and have fun！” I __3__ her.

Since I started to work for a __4__ company，however，I have done most of my traveling through the Internet.By using the Internet，I have seen the __5__ of many cities on my computer screen.And I have really made business __6__，too.With the help of the Internet，I have also got __7__ about food in different countries.

Therefore，I was beginning to feel that actual tries were __8__ necessary when I happened to read a famous chef’s(厨师)comment on the Internet.He said, “It is very difficult to have real Italian food in a foreign country，because we enjoy food and the __9__ around us at the same time.So why don’t you fly over to Italy and enjoy real Italian __10__？” Those words reminded me of my __11__ advice.As information technology __12__，you might be able to do without making some real trips.But this also means that you will miss the various __13__ you can get from traveling.

Today there are people who __14__ direct communication with others and spend much of their time on the Internet.It is not surprising to see a group of people __15__ not with each other but into their micro phones.It seems as if such people are __16__ by an invisible wall.They seem to be losing out on a good chance to __17__ and talk with other people.I do not think that they are taking good advantage of information technology.We should use information technology as a tool to make our daily __18__ more fruitful.However，we should never let it __19__ our time for face­to­face communication.Let’s make sure of information technology more __20__，and have great fun in experiencing the actual world.(2010×海南高三统一检测)

[解题导语] 本文是一篇议论文，讨论信息技术给人们的日常生活带来的利与弊。试题有一定的难度，解题时不仅要注意句子中的词语搭配，更要从整体上把握文章的结构，按照文章的行文逻辑进行合理的推断。

1．A.promised　 B．allowed　 C．hurried　 D．encouraged

解析：根据下文可知，“我”的一位教授鼓励“我”这样做。

答案：D

2．A.build up　 B．use　 C．practise　 D．exchange

解析：build up“逐渐获得，建立”。通过真实的经历建立自己的知识体系。

答案：A

3．A.agreed with　 B．learned from　 C．followed　 D．obeyed

解析：agree with sb.“同意/赞成某人(的话)”。

答案：A

4．puter 　B．food　 C．clothing　 D．machine

解析：根据下文“I have also got __7__ about food in different countries.”可得出答案。

答案：B

5．A.life　 B．rivers　 C．sights　 D．houses

解析：sights“风景、景色、名胜”，符合语境。

答案：C

6．A.plans　 B．bargain　 C．progress　 D．trips

解析：与上文“I have done most of my traveling through the Internet.”相对照。

答案：D

7．A.information　 B．taste　 C．cooks　 D．feelings

解析：在因特网的帮助下，“我”获得了不同国家有关食品的信息。

答案：A

8．A.even more　 B．no longer　 C．much　 D．actually

解析：由第二段可知通过Internet便可浏览到所需信息，所以作者觉得实地旅行“不再”是必要的。

答案：B

9．A.people　 B．drink　 C．atmosphere　 D．environment

解析：atmosphere“气氛”，我们在享受食物的同时也享受周围的气氛。

答案：C

10．A.shoes　 B．dishes　 C．customers　 D．situations

解析：上文讲述的是关于品尝意大利美食的事情。此题与之相对应，故选dishes(菜)。

答案：B

11．A.friends’　 B．parents’　 C．professor’s　 D．boss’s

解析：根据第一段可知是“教授”提的建议，其他几项文中均未提及。

答案：C

12．A.produces　 B．advertises　 C．forms　 D．advances

解析：随着信息技术的进步/发展(advance)。

答案：D

13．A.news　 B．pleasures　 C．troubles　 D．places

解析：从旅行中能获得许多乐趣。

答案：B

14．A.avoid　 B．keep　 C．lose　 D．enjoy

解析：根据下文中“spend much of their time on the Internet”和“It is not surprising to see...but into their micro phones.”可确定答案为A。

答案：A

15．A.meeting　 B．talking　 C．communicating　 D．traveling

解析：根据下文“...not with each other but into their micro phones...”可选出答案B。若选C项，communicating into...phones为错误搭配。

答案：B

16．A.stopped　 B．met　 C．surrounded　 D．hurt

解析：这样的人好似被一堵看不见的墙所包围。

答案：C

17．A.look at　 B．employ　 C．travel　 D．meet

解析：人与人之间好像没有机会见面和彼此交谈。

答案：D

18．unication　 B．study　 C．work　 D．action

解析：与上下文相对应，这一段讲的是人们的交流情况。

答案：A

19．A.spare　 B．increase　 C．reduce　 D．make use of

解析：虽然信息技术能使我们的日常交流更有成效，但是，绝不能让网络技术减少我们面对面交流的时间。

答案：C

20．A.wisely　 B．correctly　 C．or less　 D．slowly

解析：我们应更加明智地利用信息技术。

答案：A

5．A beginner’s painting can’t be compared to/with that of an expert.

4．He has concentrated on his work.

3．Have you seen the latest designs for the library?

2．The book contains all the information you need.

5．初学者的画不能与专家的画相比较。(compare)

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答案：1.The only access to the garden is through the kitchen.

4．他专注于自己的工作。(concentrate)

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3．你见过图书馆的最新设计图吗？(design)

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