题目内容

维生素A仅有6种异构体存在,指出其中最稳定、活性最强的异构体( )

A. 全反式
B. 3-顺式
C. 7-顺式
D. 5-顺式
E. 7,3-顺式

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Match the following English expressions with proper Chinese translations. (请为下列的英文短语找到相应的中文表达。)

Match the following Chinese expressions with proper English expressions. (请为下列的中文短语找到相应的英文表达。)

Choose the proper question. (请选出正确的问句。)--______________--No, I’d rather have a glass of orange juice, please.

A. Would you like a cup of tea or some coffee?
B. Would you like rice or noodles?
C. What would you like to drink?
D. What would you like to eat?

Which one is not forbidden in the cabin during the flight? (飞行中下面哪种行为是允许的?)

A. Reading magazines.
B. Making a phone call with a mobile phone.
C. Playing with a remote control toy.
D. Using a walkie talkie.

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