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问题 单项选择题

甲、乙、丙都在读同一本书，书中有100个故事，每人都从某个故事开始按顺序往后读，已知甲读了5个故事，乙读了60个故事，丙读了52个故事。那么甲、乙、丙三个人共同读过的故事至少有( )。

A．52

B．50

C．87

D．12

答案

参考答案：D

单项选择题 A1/A2型题

在X线诊断能量范围内，可增加X线对比度的X线与物质相互作用形式的是（）

A.光电效应

B.相干散射

C.康普顿效应

D.电子对效应

E.光核反应
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单项选择题

Questions 53 to 57 are based on the following passage:(10分)To the people of ancient Egypt,life on earth was short.Life after death,however,was eternal. Therefore they built their tombs of stone and they took their possessions with them into another world. The more important the people,the greater the tomb.The Pharaohs were the rulers of the country and when they died they became gods.Many of their tombs remain,and some have become a wonder of the world.These are the pyramids.The purpose of these stone mountains was to protect the burial chamber form the weather and from thieves who might try to steal the gold,jewels and precious possessions placed there to accompany the dead ruler into eternal life.Their shape,with four triangular sides spreading from a single point,represented the rays of the sun.their position on the west bank of the River Nile was where the sun set every day and where they believed it began its journey into the other world.All the burial grounds in ancient Egypt were on the west bank of the river.

Where were these pyramids located

A．Along the both banks of the Nile.

B．In another world.

C．Nera the place where they lived.

D．On the west bank of the River Nile.
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