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问题 单项选择题 B1型题

在询问疾病的既往史和危险因素时，调查对象常常因时间久远难以准确回忆，使回答不准确产生的误差称（）

A.选择性偏倚

B.无应答偏倚

C.信息偏倚

D.回忆偏倚

E.报告偏倚

答案

参考答案：D

阅读理解

I was born（出生） in a small river. When I was young, the river was my home. I did not know my father or mother, but I had many, many brothers and sisters. I swam（游泳） and played with them.

At that time I did not look like my father or mother. I had no legs, but I had a long tail（尾巴）. So I looked like a fish.

Then my tail became shorter and shorter. And now I have four legs and a very short tail.

I know I’m going to have no tail at all soon. I’m going to be like my father and mother. Then I’m going to jump（跳）out of the water. I’m going to live on the land（陆地） and in the water too. I’m going to eat a lot of insects---a lot of bad insects（昆虫）.

What am I?

小题1:The rive was my home when I was born.

小题2:I had no father or mother, but I had many brothers and sisters.

小题3:I was a fish when I was young.

小题4:I’m going to look like my father and mother.

小题5:I am an insect.
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单项选择题

液体阻力产生的根源是（）。

A、液体具有粘性

B、流动时液体与管壁间的摩擦

C、液体具有表面张力

D、管内壁大
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