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问题 单项选择题 B1型题

骨瘤好发于（）

A.颅骨和下颌骨

B.手和足的管状骨

C.骶尾椎和颅底蝶枕部

D.股骨下端、胫骨或腓骨上端和肱骨上端

E.下肢长骨骨干

答案

参考答案：A

解析：内生软骨瘤好发于手和足的管状骨。骨瘤好发于颅骨和下颌骨。

完形填空

It was Mr. Hill’s birthday that day. He was one hundred years old and many people came to小题1: ( he ) birthday party. A reporter (记者) came to the party and asked him a few questions.“Many people want 小题2:  ( know )to know how you live so long,”the reporter said,“Could you tell us小题3: it ?”“That is, I always get up at six in the morning,”said Hill.“And have three 小题4: ( meal ) a day. Never drink.”“But,”said the reporter,“my uncle also did so, and he only lived to be eighty. 小题5:  do you think of that ?”“He didn’t keep it long enough,”the old man answered.
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选择题

短周期元素X、Y、Z，其中X、Y位于同一主族，Y、Z位于同一周期。X原子的最外层电子数是其电子层数的3倍，Z原子的核外电子数比Y原子少1。下列比较正确的是

A．元素的单质氧化性：Z> Y > X

B．最高正化合价：Z > Y

C．原子半径：Z < Y < X

D．气态氢化物的稳定性：Z < Y < X
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