问题 填空题

在细胞分裂过程中,染色体数目的增加与DNA数量的增加不可能发生在细胞周期的同一个时期;DNA数目的减半与染色体数目的减半可以发生在()的同一时期。

答案

参考答案:细胞周期

阅读理解

Bruce and Bruno looked worried those days. Their father went to a town far away. Before leaving, he said he would write to them as soon as he found a job there. But two months passed, they did not hear from him. Now they had nothing except the old house and they had no money to buy any food. They thought for a long time. Then they decided to sell the house and look for their father. So one day the two brothers said goodbye to their friends and started to go. They got to the station and bought two tickets.

They were afraid that they would be hungry in the train, so they went to the market to buy something to eat. They saw bananas for the first time. The seller told them the bananas were very delicious, so they bought five kilos and got on the train with them. After a while Bruce brought out a banana and bit(咬) a little. Just at that moment the train went into a tunnel(隧道) and it was dark in the train. He was afraid and called out,“Have you taken a bite of your bananas, Bruno?”

“Not yet.”

“That’s good.”Bruce said, crying,“I did and went blind!”

小题1:Bruce and Bruno were worried because    .

A.their father couldn’t find a job in the town..

B.they didn’t hear from their father.

C.Their father left them away.

D.They had no money to buy any food.小题2:They went to the market to     .

A.look for their father.

B.buy the tickets.

C.buy something to eat.

D.sell the old house.小题3:Bruce cried because     .

A.He couldn’t see anything.

B.The train went into a tunnel.

C.He thought he was blind.

D.He bite the banana.

计算题