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问题 单项选择题 A1/A2型题

存在瘘管的残冠，根管充填后桩冠修复的最佳时机是（）

A.根管充填当天

B.根管充填后1周

C.根管充填后2周

D.根管充填后3周

E.瘘管愈合后

答案

参考答案：E

单项选择题

The natural order hypothesis means______. s

A．people acquire language rules in a predictable order

B．language rules must be taught in a certain order

C．language rules must be learned in a certain order

D．people tend to acquire simple rules early and difficult rules late
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选择题

You have to go on, _____ difficulties you meet. [ ]

A: whatever

B: however

C: whoever

D: what

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