单项选择题

Passage One Questions 26 to 28 are based on the passage you have just heard.

A．Because it was misprinted a hundred years ago.
B．Because it is rare and old.
C．Because few collectors have it.
D．Because it was made in British colonies.
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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.
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.
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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