单项选择题

The Japanese used to ______ ten million tons of coal each year.

A．extract
B．contract
C．subtract
D．constrain
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单项选择题
The water came in ______ bursts of hot and cold.
A．alternate
B．alternative
C．reciprocal
D．mutual
单项选择题
The train came to a an ______ stop, making many passengers fall off their seats.
A．interruptive
B．abrupt
C．corrupt
D．prompt
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