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.
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单项选择题
A．He agrees with the woman.B．He hasn’ t seen Derek recently.C．He thinks Derek will be late.D．He doesn’t know what the woman means.
A．He agrees with the woman.
B．He hasn’ t seen Derek recently.
C．He thinks Derek will be late.
D．He doesn’t know what the woman means.
单项选择题
A．desertB．desertedC．dessertD．desserted
A．desert
B．deserted
C．dessert
D．desserted
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