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问题 单项选择题

病例对照研究中最常见的偏倚有

A．回忆偏性

B．选择偏性

C．调查员偏性

D．混杂偏性

E．测量偏性

答案

参考答案：B

选择题
若α∈（0，
π
2
），且sin2α+cos2α=
1
4
，则tanα的值等于（　　）
A．
2
2
B．
3
3
C．
2
D．
3
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单项选择题

Questions 14-23


·Look at the ten statements for this part.
·You will hear a passage talking about the use of "eye "phrases.
·Decide whether you think each statement is right(R), wrong(W) or not mentioned(NM).
·Mark your answers on the Answer Sheet.

She tried to get him not to pay attention to her by using some methods.

A. Right

B. Wrong

C. Not Mentioned
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