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问题 双选题

2009年9月18日《北京晨报》报道，15岁的中学生志强因琐事与同校的同学晓冬发生打斗，志强持刀扎向晓冬，致其死亡。后北京铁路运输中级法院开庭审理了此案件，对尚未成年的志强做出一审判决，以故意杀人罪依法对其判处有期徒刑八年。材料中志强之所以被判刑时因为[ ]

A．违反了《中华人民共和国宪法》

B．违反了《中学生日常行为规范》

C．具有严重的社会危害性

D．触犯了《中华人民共和国刑法》

答案

CD

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.

11（）

A.put 

B.took 

C.broke 

D.went
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问答题 简答题

保险在微观经济中有哪些作用？
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