单项选择题

A．therefore
B．although
C．however
D．furthermore
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单项选择题
A．set inB．set offC．setD．set up
A．set in
B．set off
C．set
D．set up
单项选择题
A．There is a danger of accidents on the line.B．There is no danger of accidents on the line.C．Their speeds will be automatically fixed by the computers.D．One train will keep a safe distance from the other trains.
A．There is a danger of accidents on the line.
B．There is no danger of accidents on the line.
C．Their speeds will be automatically fixed by the computers.
D．One train will keep a safe distance from the other trains.
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