单项选择题

A．It is marked by a compulsive craving for drags,
B．It can cause a wide variety of mental reactions.
C．It can make people commit crimes.
D．It is not difficult to be off the habit.
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单项选择题
A．Because the anti-piracy protection has been granted to some films.B．Because the system cannot comply with high-quality DVD player.C．Because the system may need additional equipment for proper operation.D．Because there is flaw in its design.
A．Because the anti-piracy protection has been granted to some films.
B．Because the system cannot comply with high-quality DVD player.
C．Because the system may need additional equipment for proper operation.
D．Because there is flaw in its design.
单项选择题
A．He saves money to collect stamps.B．He often travels to other countries to collect stamps.C．He is fond of stamp collecting.D．He has collected a lot of stamps.
A．He saves money to collect stamps.
B．He often travels to other countries to collect stamps.
C．He is fond of stamp collecting.
D．He has collected a lot of stamps.
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