单项选择题

A．House painter.
B．Salesman.
C．Mailman.
D．Milkman.
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单项选择题
Matter on the Sun can exist only in the form of gas because of the Sun’’s ________.
A．size
B．age
C．location
D．temperature
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
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