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问题 选择题

You are really very kind.I'll never forget the ______ you have done to me. [ ]

A. favour  

B. deed  

C. help  

D. kind

答案

答案：A

选择题

It was not until midnight _____ they reached the camp site. [ ]

A.that

B. when

C. while

D. as

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多项选择题

药物安全性的指标有 （ ）

A．LD50/ED50

B．TD50/ED50

C．TC50/EC50

D．ED95~TD5

E．LD1~ED5
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