2016届安徽省高考英语一轮复习提能演练：综合二（人教版必修4～选修6）_高考复习指南

　　68. The author is obviously challenging the social norm (社会规范) that ______ .

　　A. it is important to improve goods and services

　　B. development of technology makes our life more comfortable

　　C. it is reasonable that prices are going up all the time

　　D. slightly improved new products are worth buying

　　69. According to this passage, airfares may rise because ________ .

　　A. the airplane has been improved

　　B. people tend to travel by new planes

　　C. the change is found to be reasonable

　　D. the service on the plane is better than before

　　70. According to the author, passengers would be happier if they _______ .

　　A. could fly in the latest model of good planes

　　B. could get tickets at much lower prices

　　C. see the airlines make vital changes in their services

　　D. could spend less time flying in the air

　　71. When manufactures have improved the performance of their products to a certain level, then it would be ________ .

　　A. justified for them to cut the price

　　B. unnecessary for them to make any new changes

　　C. difficult and costly to further better them

　　D. insignificant for them to cut down the research costs

　　(E)

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