试题与答案

适应于肺泡与外界空气之间进行气体交换的结构是（） A.鼻腔内有鼻毛 B.气管、支气管

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题型：单项选择题

题目：

适应于肺泡与外界空气之间进行气体交换的结构是（）

A.鼻腔内有鼻毛

B.气管、支气管都有软骨支架

C.肺泡壁由一层上皮细胞构成

D.肺泡外包绕着丰富的毛细血管

答案：

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参考答案：解析：对承运方来说，货物运输费用又由三部分构成：固定费用、可变费用和损失性费用。 固定费用，如工资、办公费、房屋设备折旧费及其修理费、劳动保护费、保险费等。这些费用是承运方的经常性开支，...

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1. In the story, ______ liked wine and good food very much.
[ ]
A. the rich man
B. the servant
C. both A and B
D. neither A and B
2. The rich man knew that it was ______ that drank the wine and ate up all the nice food.
[ ]
A. the cat
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3. The rich man told the servant that there was poison in the two bottles, because ______.
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A. there was poison in the bottles
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4. In fact, ______ ate all the nice food and drank the wine.
[ ]
A. the servant
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