问题 选择题

青蛙的受精卵发育成小蝌蚪,而乌龟的受精卵则是发育成小乌龟,这是因为

A.卵的大小不同

B.孵化的温度不同

C.产卵的地点不同

D.遗传物质不同

答案

答案:D

题目分析:青蛙的发育经过受精卵、蝌蚪、幼蛙、成蛙,受精卵经过细胞分裂、分化,形成组织、器官、系统,进而形成新个体.亲代通过精子和卵细胞把自己的基因传给了后代,从而使后代继承了亲代最基本的遗传特征,有性生殖卵的大小、温度和产卵的地点的不同不能说明动物类别的不同,而是受精卵的遗传物质决定的,因此青蛙的受精卵发育成小蝌蚪,而乌龟的受精卵则是发育成小乌龟.

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Win a week in England!

You still don’t know what to do this summer? Well, here’s your chance to win a one-week language course in Kent, England! Free4Fun and ETC (English Travel Connections) are giving  away two trips to Rochester. This historic city is less than an hour’s drive from London and close  to the sea resort of Herne Bay. It is also the home of one of England’s most famous writers,  Charles Dickens. The town of Rochester is in Southeast England. Charles Dickens often wrote  about it in his books. His home, Gad’s Hill, is there, too. A popular attraction is Rochester Castle, a large Norman fortress(堡垒). It was built in the 11th century and rebuilt during the 14th century. Other attractions are Rochester Cathedral, which was built during the 13th century, and Dickens Centre. It has got its name in honour of Dickens himself.

The trip to England includes:

*  travel by train (via the Eurotunnel) to and from any railway station in Germany

*  room and full board with a guest family for one week

*  language course in small groups

*  two trips to London

*  large choice of sports and entertainment

*  German-speaking advisors available 24 hours a day

Interested? All you have to do is to answer the following question:  When was Charles Dickens born?

So, take the chance and send your answer by 1 May to:

Free4Fun "Rochester"

Free4Fun, 24 Elphinstone Road, Hastings, 2FQ6VJ

fax: 089 / 85 763-103    e-mail: free4fun@netlight.com

The two winners will be contacted directly before 5 May. They will also be announced in the June issue of Free4Fun. Good luck!

For further information, contact:

phone: (03212) 144 43    fax: (03212) 144 42      e-mail: info@etc. com

小题1:What activities can you participate in during the trip?

A.Working as a language advisor.

B.Learning the German language.

C.Traveling by train with a guest family.

D.Enjoying sports and entertainment.小题2:If you want to win a prize you have to send your answer to         .

A.the June issue of Free4fun

B.free4fun@netlight. com

C.info@etc. com

D.ETC小题3:The persons        are likely to win the free trip.

A.who know the birth date of Charles Dickens

B.who are attracted by Rochester Castle

C.who are contacted and announced by Free4Fun and ETC

D.who know more about Charles Dickens’ works小题4:This ad was probably designed to target           .

A.Italians

B.Europeans

C.Germans

D.Americans

单项选择题