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问题 单项选择题

张某在甲公司工作3年、在乙公司工作10年、在丙公司工作2年，张某目前在丙公司工作。根据劳动合同法律制度的规定，张某可以享受带薪年休假（）天。

A.5

B.10

C.15

D.20

答案

参考答案：B

解析：（1）在确定年休假的天数时，依据的是劳动者自参加工作以来的累计工作年限，与在现单位的工作年限无关；（2）职工累计工作已满10年不满20年的，年休假10天。

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.

6（）

A.at 

B.for 

C.to 

D.of
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单项选择题

引起血小板发生第一时相聚集的因素是( )。

A．血小板释放的内源性ADP
B．血小板释放的内源性ATP
C．受损伤组织释放的ADP
D．受损伤组织释放的ATP
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