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A．Keep it away from heat, drafts, and humidity.
B．Keep it as empty as possible.
C．Wash its interior frequently.
D．Set it regularly at zero degree.
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单项选择题A．Language.B．Natural Sciences.C．Art.D．Physical culture.

A．Language.
B．Natural Sciences.
C．Art.
D．Physical culture.

单项选择题A．He becomes more independent.B．He becomes more challenging.C．He becomes more observant.D．He becomes more optimistic.

A．He becomes more independent.
B．He becomes more challenging.
C．He becomes more observant.
D．He becomes more optimistic.

单项选择题A．She graduated with honors.B．She was good at all school subjects.C．She decided to go on with her study.D．She decided to end her school life forever.

A．She graduated with honors.
B．She was good at all school subjects.
C．She decided to go on with her study.
D．She decided to end her school life forever.

单项选择题A．It will reduce the amount of pollutants in the air.B．It will increase the amount of unpleasant odors from vehicles.C．It will eventually destroy the ozone layer.D．It will reduce the cost of running large vehicles.

A．It will reduce the amount of pollutants in the air.
B．It will increase the amount of unpleasant odors from vehicles.
C．It will eventually destroy the ozone layer.
D．It will reduce the cost of running large vehicles.

单项选择题A．I hour.B．3 hours.C．2 hours.D．Four hours.

A．I hour.
B．3 hours.
C．2 hours.
D．Four hours.