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

A．67.
B．280.
C．84.
D．1648.
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