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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 othe
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 othe
admin
2014-07-25
99
问题
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 cannot reduce this output to zero. Some salt is always escaping. On a completely 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 up its secretion(分泌)of water. 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, finally, 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.
Which of the following statements is NOT the result of a lack of salt in the body?
选项
A、The body secretes more water.
B、The body dries up.
C、The person dies of thirst.
D、The person gets fatter.
答案
D
解析
细节判断题。通过定位句可以知道,没有提到变胖这个细节。
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成人本科学位英语
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