选择题：房产税实行比例税率，依照房产租金收入计算缴纳的，税率为(()。A.0.1B.0.12C.0.15D.

长期劳动力需求调整与短期相比幅度更大，是因为下列哪个效应也开始起作用？(A)规模效应(B)收入效应(C)替代效应(D)外在化效应

These young people were so _____________ about things in the U. S. that they tho

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[翻译题,4分] You needn’t go there anymore. He already knows about it.

6.The age of the boys in this class is about 18.　(A)usual(B)common(C)a