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问题 单项选择题

男婴，8个月，腹泻4天，大便10余次/日，量多，呈蛋花汤样，精神萎靡，眼泪少，尿少，血清钠133mmol/L，皮肤弹性差，唇红，呼吸深快，应诊断为()

A．重度等渗性脱水，酸中毒

B．轻度等渗性脱水，酸中毒

C．重度低渗性脱水，酸中毒

D．中度等渗性脱水，酸中毒

E．中度低渗性脱水，酸中毒

答案

参考答案：D

单项选择题

It is clear that some chemicals can damage the health of animals and humans. (1) , this is not the only problem that (2) be caused by the careless use of chemicals. Chemicals can also (3) the ecological balance of the environment. If the ecological balance is disturbed, the results can be (4) serious.The (5) of DDT illustrates the problem. DDT, a chemical which kills insects, at first seemed to be a perfect answer (6) many problems. It would control insects that caused dangerous diseases, (7) insects that caused billions of dollars of damage to crops every year. Governments permitted and even (8) the use of DDT. Farmers in many countries (9) to spray it on their crops. The (10) results were good. Damage to crops (11) down, and profits went up. However, the chemical had effects which the scientists didn’t see in (12) . First, it also killed insects which were the (13) enemies of the harmful insects and which were therefore beneficial to farmers. Second, and perhaps worse, DDT did not kill (14) harmful insect. A few insects had natural resistance to the chemical. They (15) and reproduced in large numbers. In a few years there were large numbers of insects which were not (16) by DDT, and there were (17) insects which Could act as natural (18) on these new "super-insects". Finally, it became clear that DDT was not solving the insect problem. In fact, it was making the problem worse. It (19) became necessary to find a second (20) for the effects of the first.

第（20）空应选择（）

A．cause

B．insect

C．answer

D．cure
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填空题

火焰原子吸收光度法塞曼效应校正背景的光来自同一谱线的（），而且在（）光路上通过原子化器。
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