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问题 单项选择题

病变局部可见大量泡沫细胞的疾病是（）

A.胆囊炎

B.胆囊癌

C.胆石症

D.胆囊息肉

E.胆囊腺瘤

答案

参考答案：D

解析：胆囊息肉多为胆固醇息肉，息肉内含有大量吞噬胆固醇的泡沫细胞。

单项选择题

Questions 17 to 20 are based on the following passage. At the end of the passage, you will be given 20 seconds to answer the questions.
Now listen to the passage.

Why was the speed limit first reduced to 55 miles-per-hour

A．The older people wanted it.

B．The voters decided on it.

C．It was decided that speeds above that were not safe.

D．The US had a fuel crisis.
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单项选择题

调相机在运行时，母线电压与调相机额定电压的偏差在（）范围内变动时，调相机的额定容量不变。

A.±10%

B.±5%

C.-5%～+10%

D.-10%～+5%
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