单项选择题

Which of the following is NOT cited as a means to reduce the number of cars（）

A．To pass laws to control the use of cars.
B．To improve public transport systems.
C．To increase car tax and car price.
D．To construct effective subway systems.

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How many missing American servicemen have been positively confirmed dead in Vietnam so far（）

A．67.
B．280.
C．84.
D．1648.
单项选择题
The interviewee is not self-employed mainly because（）

A．her husband likes her to work for a firm.
B．she prefers working for the government.
C．self-employed work is very demanding.
D．self-employed work is sometimes insecure.
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