单项选择题

A．A city guide.
B．A librarian.
C．A computer expert.
D．A registrar.
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单项选择题
A．Because he didn’’t feel very well.B．Because he overslept and missed the lunch.C．Because he didn’’t hear the lunch bell.D．Because he thought he couldn’’t afford it.
A．Because he didn’’t feel very well.
B．Because he overslept and missed the lunch.
C．Because he didn’’t hear the lunch bell.
D．Because he thought he couldn’’t afford it.
单项选择题
The basic principles applied to natural-gas vehicles are quite different from those applied to gasoline-powered vehicles.
A．Y
B．N
C．NG
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