第5题: [单项选择]It was because he had made such great contribution to the world peace ______ he won the Nobel Prize for Peace. A. that B. so C. since D. before 参考答案:A 答案解析:本题为语法结构题，考强调句型 It is (was) …that…。本句大意为：正是因为他为世界和平做了如此巨大的贡献，他获得了诺贝尔和平奖。
A. to prevent cardiovascular disease and cancer. B. to understand the processes that lead to cell death. C. to improve our memories. D. to do what we think is right. 参考答案:A 答案解析:[题解] 可以根据提问，在最后一段里找到一位研究人员说的话：would be to prevent cardiovascular disease and cancer。
A. different people have nearly the same opinion B. it is easy to reach a conclusion C. researchers have made a conclusion D. it is a time-consuming study 参考答案:D 答案解析:推断题。根据文章所说One area of controversy has been how much exercise is enough to improve general health，con
