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问题 单项选择题

有关鼻窦的说法正确的是（）

A.两侧对称大小一致

B.初生儿所有鼻窦均未发育

C.粘膜菲薄脆弱仅在窦口附近较厚

D.粘膜内有丰富的血管和腺体

E.后组筛窦在中鼻道筛泡处

答案

参考答案：C

选择题

Only when all the fish in the lake died _____ how serious the pollution was.[      ]

A. did the villagers realise

B. the villagers realised

C. had the villagers realised

D. the villagers had realised

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单项选择题

腰以上肢体痹痛宜用

A．独活

B．桂枝

C．桑枝

D．羌活

E．威灵仙
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