单项选择题

A．Venus is too hot.
B．There is no oil.
C．There is no water there.
D．It is lacking in carbon dioxide.
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单项选择题
A．To show that air travel is far safer than driving a car.B．To show the great responsibility shouldered by the pilots.C．To give an example of air disasters.D．To show the key role played by air traffic controllers.
A．To show that air travel is far safer than driving a car.
B．To show the great responsibility shouldered by the pilots.
C．To give an example of air disasters.
D．To show the key role played by air traffic controllers.
单项选择题
A．Making an appointment.B．Coming back about 4:00.C．How to use the library.D．How to choose a course.
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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