单项选择题
A.have no difference from place to place in the U. S. B.are over 15% in the U. S. C.have been put an end in the U. S. D.vary from place to place in the U. S.
A.get high wages from the employer B.get great benefits from the employer C.get low wages from the employer D.get high bonus from the employer
A.shopping and tipping B.sales and shopping C.sales taxes and tipping D.sales taxes and people