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.
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单项选择题
A．To indicate how climbers communicated.B．To show that climbers enjoyed many comforts.C．To show that modern telephones work at high altitudes.D．To emphasize how small some equipment had become.
A．To indicate how climbers communicated.
B．To show that climbers enjoyed many comforts.
C．To show that modern telephones work at high altitudes.
D．To emphasize how small some equipment had become.
单项选择题
A．The professor might give an exam in class.B．The man might not be able to leave campus early.C．The class might not finish their oral presentations.D．This week’s class might be longer than expected.
A．The professor might give an exam in class.
B．The man might not be able to leave campus early.
C．The class might not finish their oral presentations.
D．This week’s class might be longer than expected.
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