单项选择题
A new system of quality control was
brought in
to overcome the defects in the firm's products.
A．invested
B．introduced
C．installed
D．insisted
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单项选择题
There are altogether 13 drugs treating sleep disorders in the United States.
A． Right
B． Wrong
C． Not mentioned
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单项选择题
FDA considers it the producers’ duty to warn the users of sleeping pills about the serious side effects and to tell them how to use safely.
A． Right
B． Wrong
C． Not mentioned
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