在一项膀胱癌与吸烟关系的前瞻性队列研究中，发现男性吸烟者膀胱

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问题单项选择题

在一项膀胱癌与吸烟关系的前瞻性队列研究中，发现男性吸烟者膀胱癌发病率为48.0/10万，不吸烟者为25.4/10万。根据此资料：

相对危险度为

A．1.89

B．3.93

C．2.6

D．2.0

E．无法计算

答案

参考答案：A

填空题

根据句意用恰当的短语完成句子

1. If you want to catch that train we'd better____ for the station at once.

2. Be careful not____ the ladder.

3. I can't promise, but I____.

4. Mr. Smith needs more exercises____.

5. Mike has only driven to the pub his new car-he usually walks !

6. He_______ what he had done.

7. She's a bravely player; she never _______,

8. He_______ his success more_______ luck than to ability.

9. My friend has gone to another city, but we usually ________.

10. I_______ catch the early train, but I didn't get up in

单项选择题

某煤矿2015年3月份生产销售原煤10万吨，取得不含增值税的销售额为4000万元；开采煤矿同时生产天然气5000万立方米，本月全部销售，取得不含增值税销售额为3000万元。已知原煤的资源税税率为3%，煤矿邻近的某石油管理局天然气资源税税率为6%，该煤矿3月份应纳的资源税税额为（）万元。

A.55

B.90

C.120

D.300