题目内容
At the________ of the bell,the pupils rushed out of the classroom.
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The thieves ran away as fast as possible at the ___ of the policemen.
A. scenery B.sight C.view D. scene
He managed to reach the summit of his career, but it was at the _________ of his health.
A. consumption B. credit C. exhaustion D. expense
Now I come here at the ______ of Mr.Smith to assist him finishing the work.
A．requireB．remark
C．demandD．request
Without a sure supply of water, farming in that area remains at the _______of the weather.
A.disposal B.risk C.cost D.mercy
Many kinds of birds fly south at the ______ of winter.
A. sight B. approach C. direction D. access
