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问题 单项选择题 A2型题

为探究高血压的病因是否是与高钠的饮食有关，研究人员针对某市三甲医院其内科中的全部高血压病人进行了队列研究，以下哪项不属于队列研究的特点（）

A.属于前瞻性研究

B.由因推果

C.研究时间较短

D.观察慢性病费时

E.与病例-对照研究的思路相反

答案

参考答案：C

单项选择题

Passage Three

Which of the following statements is NOT true according to the passage

A．Over 30 oil workers have been kidnapped this year in the Niger Delta region.

B．A group calling itself the Movement for the Niger Delta People has claimed responsibility for the current reported kidnapping.

C．The last kidnapping occurred last week when a German oil worker was taken away.

D．Nigeria produces the most crude oil in Africa.
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单项选择题

黄光和蓝光混合可以得到（）。

A、白光

B、黑

C、红光

D、绿光
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