2.用X射線處理蠶蛹，使其第2號染色體上的斑紋基因移位于決定雌性的W染色體上，使雌體都有斑紋。再將雌蠶與白體雄蠶交配，其后代凡是雌蠶都有斑紋，凡是雄蠶都無斑紋。這樣有利于去雌留雄，提高蠶絲的質(zhì)量。這種育種方法所依據(jù)的原理是　　　　　　　

(　)(

A.染色體結(jié)構(gòu)的變異 　　　　　　　　B.染色體數(shù)目的變異

C.基因突變　 　　　　　　　　　　　　D.基因重組

解析：由于題中涉及的育種方法是實(shí)現(xiàn)基因的位置改變，應(yīng)屬于染色體結(jié)構(gòu)變異。

答案：A

1.(2010·濰坊模擬)下面關(guān)于染色體組、單倍體和二倍體的敘述中不正確的是　　 (　)

A.一個染色體組中不含同源染色體

B.由受精卵發(fā)育的個體，體細(xì)胞含有兩個染色體組的叫二倍體

C.含一個染色體組的個體是單倍體，單倍體不一定含一個染色體組

D.人工誘導(dǎo)多倍體惟一的方法是用秋水仙素處理萌發(fā)的種子或幼苗

解析：人工誘導(dǎo)多倍體方法有：①用一定濃度的秋水仙素處理萌發(fā)的種子或幼苗；②驟然降低培養(yǎng)溫度，誘導(dǎo)植物體產(chǎn)生多倍體。

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(廚師)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×海南高三統(tǒng)一檢測)

[解題導(dǎo)語] 本文是一篇議論文，討論信息技術(shù)給人們的日常生活帶來的利與弊。試題有一定的難度，解題時不僅要注意句子中的詞語搭配，更要從整體上把握文章的結(jié)構(gòu)，按照文章的行文邏輯進(jìn)行合理的推斷。

1．A.promised　 B．a(chǎn)llowed　 C．hurried　 D．encouraged

解析：根據(jù)下文可知，“我”的一位教授鼓勵“我”這樣做。

答案：D

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

解析：build up“逐漸獲得，建立”。通過真實(shí)的經(jīng)歷建立自己的知識體系。

答案：A

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

解析：agree with sb.“同意/贊成某人(的話)”。

答案：A

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

解析：根據(jù)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“風(fēng)景、景色、名勝”，符合語境。

答案：C

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

解析：與上文“I have done most of my traveling through the Internet.”相對照。

答案：D

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

解析：在因特網(wǎng)的幫助下，“我”獲得了不同國家有關(guān)食品的信息。

答案：A

8．A.even more　 B．no longer　 C．much　 D．a(chǎn)ctually

解析：由第二段可知通過Internet便可瀏覽到所需信息，所以作者覺得實(shí)地旅行“不再”是必要的。

答案：B

9．A.people　 B．drink　 C．a(chǎn)tmosphere　 D．environment

解析：atmosphere“氣氛”，我們在享受食物的同時也享受周圍的氣氛。

答案：C

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

解析：上文講述的是關(guān)于品嘗意大利美食的事情。此題與之相對應(yīng)，故選dishes(菜)。

答案：B

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

解析：根據(jù)第一段可知是“教授”提的建議，其他幾項文中均未提及。

答案：C

12．A.produces　 B．a(chǎn)dvertises　 C．forms　 D．a(chǎn)dvances

解析：隨著信息技術(shù)的進(jìn)步/發(fā)展(advance)。

答案：D

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

解析：從旅行中能獲得許多樂趣。

答案：B

14．A.avoid　 B．keep　 C．lose　 D．enjoy

解析：根據(jù)下文中“spend much of their time on the Internet”和“It is not surprising to see...but into their micro phones.”可確定答案為A。

答案：A

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

解析：根據(jù)下文“...not with each other but into their micro phones...”可選出答案B。若選C項，communicating into...phones為錯誤搭配。

答案：B

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

解析：這樣的人好似被一堵看不見的墻所包圍。

答案：C

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

解析：人與人之間好像沒有機(jī)會見面和彼此交談。

答案：D

18．unication　 B．study　 C．work　 D．a(chǎn)ction

解析：與上下文相對應(yīng)，這一段講的是人們的交流情況。

答案：A

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

解析：雖然信息技術(shù)能使我們的日常交流更有成效，但是，絕不能讓網(wǎng)絡(luò)技術(shù)減少我們面對面交流的時間。

答案：C

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

解析：我們應(yīng)更加明智地利用信息技術(shù)。

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．初學(xué)者的畫不能與專家的畫相比較。(compare)

________________________________________________________________________

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

4．他專注于自己的工作。(concentrate)

________________________________________________________________________

3．你見過圖書館的最新設(shè)計圖嗎？(design)

________________________________________________________________________