单项选择题

The college offers courses in a variety of (trades).

A．business
B．firm
C．work
D．occupation
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单项选择题
A vegetarian is a person who______.
A．eats the meat of animals only
B．eats the vegetable only
C．drinks milk only
D．eat nothing at all
单项选择题
the disease ( para. 7 ) refers to ______.
A．sickle-cell gene
B．malaria
C．sickle-cell anemia
D．detrimental effect
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