单项选择题

One of the mechanical solutions to car pollution is（）

A．to change the chemical structure of fuel.
B．to improve on the exhaust pipe.
C．to experiment with new engines.
D．to monitor the amount of chemicals.

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单项选择题
According to the search operation commander, the recovery of the missing Americans is slowed down because（）

A．the weather conditions are unfavorable.
B．the necessary documents are unavailable.
C．the sites are inaccessible.
D．some local people are greedy.
单项选择题
To study architecture in a university one must（）

A．be interested in arts.
B．study pure science first.
C．get good exam results.
D．be good at drawing.
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