单项选择题

A．It tends to vary geographically.
B．It corresponds to an individual’’s social class.
C．It changes over a period of time.
D．It depends on whether or not the individual is a gourmet.
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单项选择题
The space agencies are reluctant to open up space to tourists.
A．Y
B．N
C．NG
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.
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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