带式输送机上拖棍的作用是（）载重胶带，下托辊作用是（）空回胶带。
参考答案：承受、支持
德国音乐家瓦格纳称贝多芬的（）交响曲是“舞蹈的礼赞”。
A.第三
B.第五
C.第七
D.第八
E.第九
Great changes _____ in our hometown in the past ten years. [ ]
A. have taken place
B. have been taken place
C. were taken place
