The author‘s purpose of writing this passage is to__________

The author‘s purpose of writing this passage is to__________ 查看材料

A.argue for teaching bright and not-so-bright pupils in the same class

B.recommend pair work and group work for classroom activities

C.offer advice on the proper use of the library

D.emphasize the importance of appropriate formal classroom teaching

请帮忙给出正确答案和分析,谢谢!

  • 悬赏:0 答案豆
  • 提问人:00****45
  • 发布时间:2016-06-07
零基础也能修大专/本科学历
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Questions are based on the following passage.Salt is as necessary to life as water. In many areas of Africa people once drank the urine (尿)of animals because they had no other source of salt. Without salt, human beings die.The human body demands that the amount of salt in the blood always stay the same. When the body does not get enough salt, it protects itself by letting less salt leave the body in urine and sweat. But it carmot reduce this output to zero. Some salt is always escaping. On a complete saltless diet, like that of some people in Africa, the body steadily loses small amounts of salt through the kidneys (肾) and sweat glands (腺)It then tries to adjust to this loss by speeding its secretion (分泌) of water. (78)In this way, the body attempts to keep the amount of salt in the blood at the necessary level. The result is a slow drying up of body and,inally,death. The person dies of thirst.In cases where there is little or no water to drink, the body tries to do the opposite thing. Again, it must keep the salt level in the blood constant. Because it has little water, it attempts to stop water from leaving the body and to increase its secretion of salt. But, as with the escaping salt, it cannot be completely successful. Some water still leaves and the person eventually dies of thirst. In short, the body's normal needs for salt and for water are both parts of the same important need to keep the salt level in the blood constant.Some African people once drank animal urine __________                  查看材料

A.when they were going to die

B.because they were thirsty

C.because there was little salt

D.because they were short of water

In order to adjust to the loss of salt, the body __________ 查看材料

A.loses some blood

B.speeds up its secretion of water

C.speeds up its secretion of salt

D.is drying up slowly

Which of the following statements is NOT the result of a lack of salt in the body? 查看材料

A.The body secretes more water.

B.The body dries up.

C.The person dies of thirst.

D.The person gets fatter.

What does the word "constant" (Line 2, ParA.3) mean in the passage? 查看材料

A.The same.

B.Amount.

C.Going up and down.

D.Changing.

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