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
______ , most teenagers now listen to rock music. However, John prefers classical music.
A．In a word
B．In general
C．In particular
D．In total
单项选择题
I'm certain David's told you his business troubles. ______, it's no secret that he owes a lot of money to the bank.
A．However
B．Anyway
C．Therefore
D．Though
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