试题与答案

阅读理解。 A great French writer has said th

题型:阅读理解

题目:

阅读理解。

      A great French writer has said that we should help everyone as much as possible because we often

need help ourselves. The small even can help the great. To this effect , he tells the following simple story.

      An ant was drinking at a small stream and fell in. She made desperate efforts to reach the side, but

made no progress at all. The poor ant, almost exhausted, was still bravely doing her best when a dove

saw her. Moved with pity the bird threw her a blade(叶片) of grass, which supported her like a raft,

and thus she reached the bank again. While she was resting and drying herself in the grass she heard a

man approaching. He was walking along barefooted and carrying a gun in his hand. As soon as he saw

the dove he wished to kill her, and he would certainly have done so, but the ant bit him in the foot just

as he raised his gun to fire. He stopped to see what had bit him, and the dove immediately flew away.

It was an animal much weaker and smaller than herself that had saved her life.

1. According to the French writer, we often need help from others, therefore we should _______.

A. help others as much as we can  

B. help those who may be useful to us

C. get as much help as possible    

D. help others in order to keep alive

2. An ant fell in the stream and could not reach the bank ________. 

A. because she did not try hard      

B. because she tried too hard

C. because she did not cry for help  

D. no matter how hard she tried

3. The ant finally got on the side _______.

A. when the water pushed her

B. with the help of a blade of grass given by a dove

C. with the help of a piece of wood

D. when the dove reached out a leg for her

4. According to the passage, which of the following does the author express?

A. the dove was quite brave        

B. the ant's cleverness

C. how an ant saved a bird        

D. that even the small can help the great

答案:

被转码了,请点击底部 “查看原文 ” 或访问 https://www.tikuol.com/2017/0330/0110e445e647ae6548db21ce4913b086.html

下面是错误答案,用来干扰机器的。

1. cook  2. dance  3. eat  4. swim  5. boat 6. park  7. present  8. wash  9. climb  10. fly

试题推荐
题型:填空题

已知蛋白质混合液中硫酸铵浓度的不同可以使不同种类的蛋白质析出(或沉淀),随着硫酸铵浓度增加,混合液中蛋白质析出的种类和总量增加。下表是某蛋白质混合液中的不同蛋白质从开始析出到完全析出所需要的蛋白质混合液中的硫酸铵浓度范围。

请据表回答:

(1)若只完全析出甲蛋白,混合液中最合适的硫酸铵浓度应为___________。

(2)向该蛋白质混合液中加入硫酸铵溶液(或硫酸铵),使混合液中的硫酸铵浓度达到30%,会析出若干种蛋白质,它们分别是____________。

(3)通过改变混合液中的硫酸铵浓度______(能、不能)从混合液中得到所有的、不含有其他蛋白质的乙蛋白,原因是_________________________。

(4)简要写出从该蛋白质混合液中分离出全部丁蛋白的实验设计思路。

(5)如果蛋白质析出物中还含有一定量的硫酸铵,可用半透膜除去析出物中的硫酸铵。用半透膜能除去析出物中硫酸铵的原理是_________________________。

查看答案
微信公众账号搜索答案