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
The building around the corner caught fire last night. The police are now ______ the matter.
A．seeing through
B．working out
C．looking into
D．watching over
单项选择题
The wild flowers looked like a soft orange blanket ______ the desert.
A．covering
B．covered
C．cover
D．to cover
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