单项选择题

In ______ review of 44 studies, American researchers found that men and women who ate six key foods daily cut the risk of ______ heart disease by 76%.

A. a; the
B. the; a
C. a; /
D. /; a
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单项选择题
Although the wind has ______ , the rain remains steady, so you still need a raincoat.
A. turned up
B. gone back
C. died down
D. blown out
单项选择题
I was giving a talk to a large group of people, the same talk I ______ to half a dozen other groups.
A. was giving
B. am giving
C. had given
D. have given
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