Three hundred firemen raced to the hotel after a smoke detector________the alarm

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Three hundred firemen raced to the hotel after a smoke detector________the alarm soon after midnight.[ ]
A. set off
B. set out
C. give away
D. give off

答案

举一反三

People have planted a great many trees in order to ________ wind and sand in the desert. [     ]
A．hold down
B．hold up
C．hold back
D．hold out

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The idea puzzled me so much that I stopped for a few seconds to try to________.[     ]
A. make it out
B. make it off
C. make it up
D. make it over

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Men and women can ________ people from all over the world by sending and receiving
electronic mail.[     ]
A．agree with
B．communicate with
C．communicate to
D．write to

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Although lots of people were watching around，none of them ________. [     ]
A．was offered to help
B．was offering help
C．offered helping
D．offered to help

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The man sitting in the front row________and stared at us when we made such much noise.[     ]
A. turned out
B. turned round
C. turn back
D. turned to

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