随车起重机适用于（）
A.各类起重作业
B.起重运输行业
C.码头装卸
参考答案：B
Pleasant music is often played_____classes to make students refreshed and relaxed for a while.
A．between
B．among
C．over
D．after
松狮蜥蜴的老家是哪里？（）
A.非洲
B.澳洲
C.亚洲
D.大洋洲
