单项选择题

A．I’d try it.
B．I think so.
C．I feel nervous.
D．I’ d love to.
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单项选择题
A nation on wheels means that .
A．the country is producing the best cars in the world
B．everyone 4n this country owns a car
C．cars play a very important role in people’ lives
D．there are more cars than trains in this country
单项选择题
There is no question that impure air is a health problem of great and increasing importance.
A)不洁空气正在严重地而且越来越严重地威胁着人们的健康，这是毫无疑问的。
B)毫无疑问，空气污染对人们的健康具有很大的危害，而且这种危害越来越严重。
C)不洁空气对健康产生着越来越严重的威胁的问题是不存在的。
D)空气污染极大地危害了人们的健康，这引起人们越来越多的重视。
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