单项选择题

A．It’’s less time-consuming.
B．His wife is tired of cooking.
C．It’’s part of his job.
D．He is sick of home-cooked meals.
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单项选择题
The author regards the practice of using drugs for medically valid purposes before FDA approval as ______.
A．an illegal activity
B．a dangerous policy
C．a necessary compromise
D．a short-term phenomenon
单项选择题
With what topic is the second paragraph mainly concerned
A．How the Sun evolved.
B．The structure of the Sun.
C．Why scientists study the Sun.
D．The distance of the Sun from the planets.
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