第6题:[单选题] Consider Figure 9.2. Policies that permit Mexican workers to freely migrate to the United States would likely be resisted by: A. U.S. capital owners B. Native U.S. workers C. U.S. capital owners and native U.S. workers D. Neither U.S. capital owners nor native U.S. workers 参考答案:B
第16题: [单项选择]The shortage of energy is getting worse. It ______an immediate solution. A. calls off B. calls up C. calls for D. calls at 参考答案:C 答案解析:短语辨析。call off取消如:I've called off the trip.我取消了旅行。call up召集;打电话;使人想起,如:He called me up from New York.