单选题：Scientists are not sure why we need sleep.

题目内容：

Scientists are not sure why we need sleep. A．Right
B．Wrong
C．Not Mentioned

参考答案：

答案解析：

The frightening news is spread across the whole country.

The frightening news is spread across the whole country.A．surprising B．boring C．

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分类：卫生类题型：单选题

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通过稳定肥大细胞膜而预防各型哮喘发作的是（　　）A．沙丁胺醇 B．扎鲁司特 C．噻托溴铵 D．齐留通 E．色甘酸钠

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关于眼用制剂的说法，错误的是（　　）A．滴眼液应与泪液等渗 B．混悬性滴眼液用前需充分混匀 C．增大滴眼液的黏度，有利于提高药效 D．用于手术后的眼用制剂必须保

分类：卫生类题型：单选题