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问题 选择题

John           a doctor when he         up.   [ ]

A. is; grow          

B. are; grow  

C. is going to be; grow  

D. is going to be; grows

答案

答案：D

选择题

Rarely ________ such a silly thing.

A．have I heard of

B．I have heard of

C．I have been hearing of

D．have I heard from
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单项选择题

牙体硬组织中氟含量由高向低正确顺序是（）。

A．釉质表层＞牙本质＞釉质深层

B．牙本质＞釉质表层＞釉质深层

C．牙本质＞釉质深层＞釉质表层

D．釉质表层＞釉质深层＞牙本质

E．釉质深层＞釉质表层＞牙本质
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