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问题 单项选择题

《国家基本药物目录》原则上

A．每一年调整一次

B．每两年调整一次

C．每三年调整一次

D．每四年调整一次

E．每五年调整一次

答案

参考答案：B

填空题
根据句意从方框内选择合适的词填空。
bright, achieve, certain, fairly, require
1. My old mobile phone is broken. It _____ mending.
2. For _____ reasons he was unable to attend the meeting.
3. She thinks she's _____ a lot this year. She's proud of what she's learnt.
4. English is _____ useful, but it's difficult to learn.
5. Simon is a _____ boy and he works hard. Everyone thinks that he will have a ________ future.
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单项选择题

设S：x2+y2+z2=a2（z≥0），S1为S在第一卦限中的部分，则有（）。

A.A

B.B

C.C

D.D
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