第21题: [多项选择]发展中国特色社会主义，必须( ) A. 坚持改革开放 B. 以阶级斗争为纲 C. 坚持四项基本原则 D. 牢牢把握经济建设这个中心 参考答案:A,C,D 答案解析:[解析] 坚持改革开放，坚持四项基本原则，牢牢把握经济建设这个中心是发展中国特色社会主义必然要求。只有社会生产力发展了，综合国力增强了，人民生活水平提高了，强国富民的爱国愿望才能实现。
第32题: [单项选择]{{B}}Passage One
Questions 26 to 28 are based on the passage you have just heard.{{/B}} A. The earth will get even cooler. B. No species will survive in fifty years. C. 30% of all life forms will become extinct by 2050. D. No sun’s heat can reach the earth at all. 参考答案:C 答案解析:[听力原文]
What will be expected to happen if people continue to produce greenhouse gases
第33题: [单项选择]涡流检测法是一种无损检查法（）。 A. 对结构表面近表面疲劳性裂纹有较高的灵敏度 B. 涡流检测法适用于磁性材料的检测 C. 空机重心应该在飞机实用重心范围内 D. 涡流检测法不适合于铝合金构件的检测 参考答案:A
第37题: [单项选择]Questions 74-76 refer to the following lecture. Who is the speaker. A. The general accountant of the company B. The Dean of the IT Department C. A professor on business communication D. A broadcaster of a TV station 参考答案:C
