单项选择题

In the United States, the number of (deads) due to heart attack and (related) conditions (fell) by 25 percent (between) 1985 and 1990.

A．deads
B．related
C．fell
D．between
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单项选择题
(The more straighter) the sun's rays shine down (upon) the earth, (the more heat) they give to the part of the earth (they touch).
A．The more straighter
B．upon
C．the more heat
D．they touch
单项选择题
It is no good ______ remember grammatical rules; you need to practise what you have learned.
A．trying to
B．to try to
C．try to
D．tried to
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