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问题 单项选择题

原先已取得动植物检疫证书签证资质，且签证工作经历满（）年的人员，可经直属局审核后直接转为有资质的签证兽医官或签证植物检疫官.

A.3

B.4

C.5

D.6

答案

参考答案：C

填空题

用所给动词的适当形式填空。

1. Tony often ______ (go) online at weekends.

2. ______ his brother often ______ (play) computer games?

3. Mary and her sister ______ (send) emails on the computer but they ______ ______ ( not play )

    games on it.

4. First, use the mouse ______ ______ (click) "new document".

5. His father ______ ______ (not watch) TV every evening but he often ______ (write) novels on his

    computer.

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单项选择题

颌下腺炎常见的原因是

A．牙槽脓肿

B．淋巴结炎

C．结石阻塞导管

D．冠周炎

E．血源性感染
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