单项选择题

A．There are over 1,000 miles of track in Britain.
B．In Britain there are about 250,000 miles of track.
C．There are over 13,000 miles of track in England.
D．In England there are 133,000 miles of track.
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单项选择题
A．She needs a new raincoat or umbrella.B．It will probably rain tomorrow.C．She doesn’’t know what the weather will be like tomorrow.D．She doesn’’t know where the man put his raincoat or umbrella.
A．She needs a new raincoat or umbrella.
B．It will probably rain tomorrow.
C．She doesn’’t know what the weather will be like tomorrow.
D．She doesn’’t know where the man put his raincoat or umbrella.
单项选择题
In 1961, NASA has encouraged studies of spaceplanes that could be built using existing technology.
A．Y
B．N
C．NG
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