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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.
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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.

单项选择题A．They are more convenient.B．Their storage space is more accessible.C．They are more energy-efficient.D．They take up less floor area.

A．They are more convenient.
B．Their storage space is more accessible.
C．They are more energy-efficient.
D．They take up less floor area.

单项选择题A．Five.B．Seven.C．Six.D．Eight.

A．Five.
B．Seven.
C．Six.
D．Eight.

单项选择题A．Students are less interested in the topics.B．Most courses for senior students are given on a one-to-one basis.C．The size of lecture classes shouldn’t have been that large.D．There are more choices available for students.

A．Students are less interested in the topics.
B．Most courses for senior students are given on a one-to-one basis.
C．The size of lecture classes shouldn’t have been that large.
D．There are more choices available for students.

单项选择题A．Hiking.B．Swimming.C．Canoeing.D．Camping.

A．Hiking.
B．Swimming.
C．Canoeing.
D．Camping.