单项选择题

It is implied but not stated that Quickwheel ______.

A．can't be used in place of a tire over long distance
B．will be available chiefly in the U. S.
C．can be folded and unfolded
D．functions well over various kinds of road surfaces

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单项选择题

Which of the following can be inferred from the passage

A．One should always be positive about invitations.
B．One should accept invitations at all costs.
C．One's presence is a way to show his emotion.
D．One's presence can mean a lot to others spiritually.

单项选择题

In the first paragraph, disabled motorists means ______.

A．motorists who can't walk
B．motorists whose cars are broken
C．drivers whose tire goes flat
D．drivers who are hurt in an accident