They _____ another door. It is the food

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问题选择题

They _____ another door. It is the food shop. [ ]

A. pass

B. past

C. is pass

答案

答案：A

单项选择题

A distress signal（）.

A.consists of 5 or more short blasts of the fog signal apparatus

B.consists of the raising and lowering of a large white flag

C.may be used individually or in conjunction with other distress signals

D.is used to indicate doubt about another vessel's intentions

单项选择题 B型题

以下方法检查的杂质是

旋光度测定法（）

A．硫酸阿托品中的莨菪碱

B．硝酸士的宁中的马钱子碱

C．盐酸吗啡中的罂粟酸

D．硫酸奎宁中的其他生物碱

E．盐酸麻黄碱中的有关物质