单项选择题

A．The man bas a decayed back tooth.
B．The man bas discolored teeth.
C．The man bas a chipped front tooth.
D．The man bas a crowned tooth.
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单项选择题
A．A research assistant.B．A writer.C．An office clerk.D．A student.
A．A research assistant.
B．A writer.
C．An office clerk.
D．A student.
单项选择题
A．They reduce a person’s appetite.B．They keep a person from being persistent in face of trouble.C．They make a person’s nerve system weak.D．They make a person more vulnerable m disease.
A．They reduce a person’s appetite.
B．They keep a person from being persistent in face of trouble.
C．They make a person’s nerve system weak.
D．They make a person more vulnerable m disease.
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