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第1题

7.If we _______ everything ready by now， we should be having a terrible time tomorrow. A.hadn.t got B. didn. t get C
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第2题

6.When the city was _______， everyone knew that total defeat was certain. A.cut off B.cut down C.cut across D.cut out
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第3题

5.All the characteristics that distinguish birds _______ other animals can be traced to prehistoric times. A.to B.betw
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第4题

∫1 0 dx∫1-x 0 f(x,y)dy=() A.∫1-x 0 dy∫1 0 f(x,y)dy B.∫1 0 dy∫1-x 0 f(x,y)dy C.∫1 0 dy∫1-y 0 f(x,y)dy D.∫1 0 dx∫1
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