单项选择题

A．They reduce a person’’s appetite.
B．They make a person less persistent in face of trouble.
C．They make a person’’s nervous system weak.
D．They make a person more vulnerable to disease.
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单项选择题
A．The son.B．The father.C．The mother.D．Aunt Louise.
A．The son.
B．The father.
C．The mother.
D．Aunt Louise.
单项选择题
I think symmetry may be the only way to achieve simplicity, so it’’s important enough to be mentioned on its own.
A．Y
B．N
C．NG
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