在人群中进行高血压筛检，经筛检出的病例得到提前治疗，而表面上

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问题单项选择题

在人群中进行高血压筛检，经筛检出的病例得到提前治疗，而表面上延长了生存时间，用这类病例来研究疾病的生存期可能会引起（）

A.检出症候偏倚

B.时间效应偏倚

C.领先时间偏倚

D.病程长短偏倚

E.以上都不是

答案

参考答案：C

解析：领先时间偏倚指筛检诊断时间和临床诊断时间之差被解释为因筛检延长的生存时间。

填空题

小丽站在竖直放置的平面镜前5m处，她的像距离平面镜_______m。当她向平面镜前进2m时，她在平面镜中像的大小将__________（选填“变大”、“减小”或“不变”）。利用平面镜可以改变光线的。光线与平面镜的夹角是90°时，光线的入射角是；当入射光线与镜面的夹角由30°增大到35°时，则反射角 5°（选填“增大”或“减小”）。

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阅读理解

Welcome to one of the largest collections of footwear（鞋类）in the world that will make you green with envy（嫉妒）. Here at the Footwear Museum you can see exhibits（展品）from all over the world. You can find out about shoes worn by everyone from the Ancient Egyptians to pop stars.

Room 1 The celebrity（名人）footwear section is probably the most popular in the entire museum. Started in the 1950s there is a wide variety of shoes and boots belonging to everyone from queens and presidents to pop stars and actors! Most visitors find the celebrities' choice of footwear extremely interesting.	Room 2 Most of our visitors are amazed and shocked by the collection of “special purpose” shoes on exhibition here at the Museum of Footwear. For example, there are Chinese shoes made of silk that were worn by women to tie their feet firmly to prevent them from growing too much!
Room 3 The museum also exhibits shoe shaped objects. The variety is unbelievable. For example , there is a metal lamp that looks like a pair of shoes, and Greek wine bottles that are like legs!	The footwear Library People come from all over the world to study in our excellent footwear library. Designers and researchers come here to look up information on anything and everything related to the subject of footwear.

小题1:Where would you find a famous singer's shoes?

A．Room 1.

B．Room 2.

C．Room 3.

D．The Footwear Library

小题2:All exhibits in each room .

A．share the same theme	B．have the same shape
C．are made of the same material	D．belong to the same social class

小题3:Which of the following is true according to the text?

A．The oldest exhibits in Room 1 were made in the 1950s.

B．Room 2 is the most visited place in the museum.

C．Room 3 has a richer variety of exhibits than the other two.

D．Researchers come to the Footwear Library to look up information.

小题4:The purpose of the text is to get more people to ____________.

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