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问题 多项选择题

在不可控风险中，宏观环境变化的风险主要由( )变动引起。

A．不可抗力的自然因素

B．政治因素

C．政策因素

D．社会因素

答案

参考答案：A,B,D

解析： 不可控风险可分为宏观环境变化的风险和政策性风险。宏观环境变化的风险是通过影响商品供求关系进而影响相关期货品种的价格而产生的。具体可分为不可抗力的自然因素变动的风险，以及由于政治因素、经济因素和社会因素等变化的风险。因此，本题的正确答案为ABD。

单项选择题

肾窦超声表现为一椭圆形的高回声区，其解剖基础为：()

A．肾盂、肾盏、肾血管、脂肪组织

B．肾周脂肪

C．肾实质

D．肾皮质

E．肾髓质
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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（7）空应选择（）

A．as well as

B．as well

C．but

D．also
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