单项选择题

A．A fuel that burns cleanly.
B．An oil additive that helps cool engines.
C．A material from which filters are made.
D．An insulating material sprayed on engine parts.
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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.
单项选择题
A．She doesn’t like football.B．She has no money left.C．She isn’t feeling well.D．She’s too busy to go.
A．She doesn’t like football.
B．She has no money left.
C．She isn’t feeling well.
D．She’s too busy to go.
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