It can be inferred from the passage that ______.
A. we must control our emotions in daily life
B. emotions play a more important pan than we realize
C. positive emotions such as love and joy are good for us
D. negative emotions such as hate and sadness prevent us from rational thinking
【B7】
A. and
B. although
C. but
D. however
UNIX系统中，关于cp命令，下列()是错误的。
A. cp filel file2
B. cp filel file2 /tmp
C. cp-r filel file2
D. cp-r /tmp/mytmp
【B11】
A. downtown
B. suburbs
C. proper
D. districts
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