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问题 多项选择题

工人工资y（元）依劳动生产率x（千元）的回归方程为y=10+70x，这意味着，如果劳动生产率（）

A、等于1000元，则工人工资为70元

B.每增加1000元，则工人工资增长80元

C.不变，则工人工资为80元

D.增加1000元，则工人工资平均提高70元

E..减少500元，则工人工资平均减少35元

答案

参考答案：D, E

单项选择题

未经卫生检疫机关实施卫生处理，擅自排放压舱水，移下垃圾、污物等控制的物品的，处以 ( )的罚款。

A．1000元以上1万元以下

B．1000元以上3万元以下

C．5000元以上1万元以下

D．5000元以上3万元以下
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单项选择题

Until recently, most population growth has occurred in relatively dense urban environments. In (91) words, even if we were witnessing rapid population growth, that would not mean that the (92) were filling in with people. (93) , the urban areas would tend to become more crowded. Historically, we find that people have moved to (94) the jobs were. Jobs were usually in ports or locations with many natural (95) . After transportation became relatively cheap, other geographical locations became (96) of economic activity. One factor that determines where people will move to, even when transportation becomes cheap, is (97) . And individuals working in cities (98) higher incomes than those working in (99) areas. Hence, population has tended until the 1970s to (100) in our major urban centers. Recently population has (101) out of the Northeast to the South and to the West for the more pleasant climates. If people did not (102) from living in large cities, there would likely be a much more even population distribution (103) our entire land area. Probably, if this (104) the case, there would be less concern over population (105) Indeed, one need only (106) a cross-country drive or plane trip to realize how (107) populated these United States really are. This is not to say that we should or should not do something about (108) growth. The shortage of people in certain areas merely demonstrates that overpopulation in the United States is really only a problem in (109) urban environments. And this problem may be slowly correcting (110) .

A．withdraw

B．derive

C．develop

D．benefit
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