题目

Great changes_______ in the city, and a lot of factories_______.     A.have been taken place, have been set up   B.have taken place, have been set up     C.have taken place, have set up           D.were taken place, were set up 答案：B不同状态的物质中有一定体积的是 （ ）A. 只有气体 B. 只有固体 C. 只有液体 D. 固体和液体