单项选择题

The initials CBD are most likely to stand for ______.

A．Chief Board of Directors
B．Central Bank of Development
C．Central Business District
D．Chief Business Developers
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单项选择题
According to Dr. Ralph Paffenbager's study, ______.
A．aerobic exercise help prevent lung diseases
B．vigorous exercise is dangerous for poeple over 50
C．weight lifting can do much good to the frail elderly
D．the more exercise one does, the less one is likely to die
单项选择题
Couch potatoes probably means ______.
A．people who suffer high mortality
B．people who take little exercise
C．people who walk 40 miles a week
D．people who have a lower rate of heart disease
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