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问题 单项选择题

下列关于氟中毒的论述中错误的是（）。

A.发病有明显的性别差异

B.氟斑牙多见于恒牙

C.从非病区搬人的居民比当地居民易患病

D.随年龄增加患氟骨症的病人增多

E.氟骨症多见于16岁以后的成年人

答案

参考答案：A

选择题

The president, as well as his bodyguards, _______ to the nuclear station(核电站), _______ there was an accident 20 minutes ago.

A．have come ; which

B．come; in which

C．has come ; where

D．came; in where
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填空题

       爸爸给你装修了书房，你准备在书房里写上自己的座右铭或喜欢的名言（格言），你准备写哪些呢？原因是什么？

第一句：                                                                                                        

选择它的原因是：                                                                                                        

第二句：                                                                                                        

选择它的原因是：                                                                                                        

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