在病例对照研究中（） A.应尽可能采用双盲法 B.分组要求随机化_爱下问搜题

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问题单项选择题 A1型题

在病例对照研究中（）

A.应尽可能采用双盲法

B.分组要求随机化

C.随访观察以便得到结果

D.回忆偏倚难以避免

E.混杂偏倚容易控制

答案

参考答案：D

选择题

--What of noodles would you like?

--Tomato and beef noodles.

A．a kind

B．kind

C．kinds

D．size

补全对话，情景问答

根据所给句子，选择最佳的应答语。每个选项只能用一次。
( )1. What would you do if you had one million dollars?
(     )2. I don't know what to wear if I take Tom's party.
(    )3. I don't know whether I should take a present or not
(     )4. I can't sleep well at night before I take a big exam.
(    )5. What should I do if I get nervous before I go to a big party?

A. If I were you, I'd take a long walk before going to bed.
B. I would build a school for the homeless children.
C. You'd better eat lots of fruit and vegetables to solve this problem.
D. If I were you, I'd wear a white shirt and black pants.
E. If I were you, I wouldn't help him.
F. You can take a small present.