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问题 单项选择题

刚性防水材料中的阳光板是以( )为原料经热挤出工艺加工成型的透明加筋中空板或实心板。

A．聚碳酸塑料

B．聚氯乙烯树脂

C．氯化聚乙烯树脂

D．环氧树脂

答案

参考答案：A

单项选择题 A1/A2型题

牙龈出血可能是缺乏以下哪种维生素引起的（）

A.维生素A

B.维生素B

C.维生素C

D.维生素D

E.维生素E
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单项选择题

Passage One
Questions 26 to 28 are based on the passage you have just heard.

A．He was born in Chicago in 1910.

B．He ever sold newspapers in Chicago.

C．He made several fills with an old camera.

D．He end his brother set up a company in 1932.
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