问题 问答题 简答题

中间丝的特点。

答案

参考答案:

1、具有组织特异性。

2、微管与微丝都是由球形蛋白装配起来的,而中间丝则是由长杆状的蛋白质组装而成。

3、中间丝结构极其稳定。

阅读理解

Most American families are smaller than the families in other countries. They have one or two parents and one or two children. Children in the US will leave their parents’ home when they grow up. They usually live far from their parents because they want to find good jobs. They often write to their parents or telephone them. And they often go to visit their parents on holiday. Parents usually let their children choose their own jobs. Americans think it important for young people to decide their lives by themselves. Children are asked to do some work around their house. And in many families, children are paid for doing some housework so that they learn how to make money for their own use.

小题1:There are _____ people in most American families.

A.1—2

B.2---4

C.3---4

D.4---6小题2:When children grow up, they leave their parents’ home to _____.

A.get married

B.find good jobs

C.be free

D.study小题3:They visit their parents ______

A.on weekdays

B.at weekends

C.at any time

D.on holiday小题4:Which of the following statements is wrong?

A.Children have the freedom to choose their own jobs.

B.Parents don’t ask their children to do housework.

C.Parents think it important for children to make their own decision.

D.When children grow up, they usually live far away from their home.小题5:Some parents pay their children for doing housework because ______.

A.children can learn how to make money for themselves.

B.their children asked them to do so

C.they are rich

D.the children work hard

单项选择题 案例分析题

Once there was a little girl who came to live in an orphanage (孤儿院). As Christmas time was drawing near, all of the other children 11 telling the little girl about the beautiful Christmas tree that would appear in the hall downstairs on Christmas morning. After their usual 12 , each child would be given their only Christmas gift, a small orange.

The headmaster of the orphanage was very 13 with the kids. So on Christmas Eve, when he 14 the little girl slipping down the stairs to peek(偷看)at the much-heard-of Christmas tree, he 15 that the little girl would not receive her Christmas orange because she had been so curious as to disobey the rules. The little girl ran back to her room 16 , crying at her terrible fate. The next morning as the other children were going down for breakfast, the little girl stayed in her bed. She couldn’t 17 the thought of seeing the others receive their gift while there would be 18 for her. Later, as the children came back upstairs, the little girl was surprised to be handed a napkin (餐巾). As she carefully opened it, there, to her 19 , was an orange all peeled and sectioned (分瓣). “ How could this be? ” she asked. Then, she realized how each child had taken one section from their orange for her so that she, too , would have a Christmas orange. What an example of the true meaning of Christmas those orphan children showed that morning! How I 20 the world would show the same kind of concern for others, not only at Christmas, but throughout the year!

请在14处填上正确答案()

A.caught

B.took

C.held

D.kept