单项选择题

A．Then
B．But
C．Thus
D．Whereas
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单项选择题
A．AlthoughB．BecauseC．ThereforeD．However
A．Although
B．Because
C．Therefore
D．However
单项选择题
A．Warn us of the danger of smoking before children.B．Warn people with breathing problems not to smoke.C．Warn us that mothers who smoke may affect their children’s health.D．Warn us that fathers who smoke may affect their children as mothers.
A．Warn us of the danger of smoking before children.
B．Warn people with breathing problems not to smoke.
C．Warn us that mothers who smoke may affect their children’s health.
D．Warn us that fathers who smoke may affect their children as mothers.
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