单项选择题

A．Drugs have caused American people to have no enough drugs of medical use.
B．Drugs have ruined many American people’’s mind.
C．Drugs have caused many American people to lose health.
D．Both B and C
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填空题
A．learnB．learntC．learningD．have learnt
单项选择题
The emotional aspects of an object are more important than its physical aspects in that they________.
A．help society exploit its members for profit
B．encourage us to perform important tasks
C．help to perfect the legal and penal system
D．help us to adapt our behavior to the world surrounding us
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