单项选择题

Questions 11 to 18 are based on the conversation you have just heard.

A．Making an appointment.
B．Coming back about 4:00.
C．How to use the library.
D．How to choose a course.
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单项选择题
A．We should blame external factors.B．We should blame internal factors.C．We should blame others.D．We needn’t blame ourselves.
A．We should blame external factors.
B．We should blame internal factors.
C．We should blame others.
D．We needn’t blame ourselves.
单项选择题
A．We will not have enough food to eat.B．All the oil that drives our cars will be used up.C．The earth will become too crowded.D．There will be little water left on Earth.
A．We will not have enough food to eat.
B．All the oil that drives our cars will be used up.
C．The earth will become too crowded.
D．There will be little water left on Earth.
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