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单项选择题

A．They will produce negative effects.
B．They will produce positive effects.
C．They will produce no effects.
D．They will produce the desired effects.
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单项选择题A．When the light above the seat goes off.B．When the bell above the seat rings;C．When the speaker above the seat sounds.D．when the stewardess informs him.

A．When the light above the seat goes off.
B．When the bell above the seat rings;
C．When the speaker above the seat sounds.
D．when the stewardess informs him.

单项选择题A．In a factory.B．At the library.C．In his department.D．In the dining-room.

A．In a factory.
B．At the library.
C．In his department.
D．In the dining-room.