单项选择题

A．Because he has enough money to buy stamps.
B．Because he used to receive stamps as gifts.
C．Because stamp collecting is his hobby.
D．Because he invests in stamps.
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单项选择题
A．Drug abuse can cause a lot of adverse physical reactions.B．Drug abuse can cause malnutrition.C．Drug abuse may damage the heart, liver and brain.D．Drug abuse can cause cancer.
A．Drug abuse can cause a lot of adverse physical reactions.
B．Drug abuse can cause malnutrition.
C．Drug abuse may damage the heart, liver and brain.
D．Drug abuse can cause cancer.
单项选择题
A．One.B．Two.C．Three.D．Four.
A．One.
B．Two.
C．Three.
D．Four.
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