题目

如图所乐的各种剪刀,其中明显作为省力杠杆使用的是        A                  B               C               D 答案:BThe new bridge _____________ in our district is for us Beijingers. Though there is a noise most of the day, we still feel happy about it. A. built                           B.has been built C.being built                       D.to be built  
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