单项选择题

Recent studies have identified four major global environmental risks— acid rain, ozone depletion, deforestation and the greenhouse effect.

A．recognized
B．proved
C．got rid of
D．multiplied
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单项选择题
In 1984, President Ronald Reagan proposed that the United States construct a launch laboratory for a new era of space exploration.
A．probing
B．revenge
C．invasion
D．expansion
单项选择题
Sometimes a dictionary designates a noun as attributive, which means that it can be used to describe another noun or name its attributes.
A．conveys
B．defines
C．indicates
D．explains
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