[解析]从下文中searchers可推出此空应填C项。 答案：C
40. A. watching B. collecting C. recognizing D. finding 答案：D
41. A. Instead B. But C. Besides D. And 答案：B
42. A. guess B. judge C. understand D. prove
[解析]this指后面要提到的一系列问题，所以此空填C项。 答案：C
43. A. write B. make C. keep D. leave
[解析] leave marks意为“留下标记”。 答案：D
44. A. want B. ask C. allow D. agree答案：A
45. A. lost B. buried C. hidden D. hung 答案：B
46. A. it B. searchers C. planes D. he
[解析]指头盔。头盔是bright orange（鲜桔红色），如果不是有意藏起来，飞机是可以发现的。所以这里应该填A项（it），而不填D项（he）。 答案：A
47. A. didn’t B. mustn’t C. couldn’t D. shouldn’t 答案：A
48. A. proud B. stupid C. strong D. strange
[解析]A项(proud)与前面第三段第一句相符。 答案：A
49.A. only B. lost C. lonely D. own答案：D
50. A. had B. made C. won D. did [解析] it指his way. 答案：
写作训练
写作训练每个单元都必须进行，每个单元都可以根据该单元的主题设计一个写作的题目，让学生写一篇作文，事后一要进行讲评。
如在该单元可以设计以下的一个书面表达作业：
写作训练1
根据以下信息，写一篇介绍刘璇的短文，字数一百左右。
中国体操明星，前奥运会金牌得主刘璇，现在就读于北京大学，主修（major in）新闻(journalism)。她之所以选择新闻专业,是由于她以前常与记者接触，所以对新闻专业感兴趣；并且她觉得学习新闻可以让她学习到许多不同领域的知识。她想在将来成为一个国际体操裁判。她的人生格言(motto)是：“如果你想成为一个胜利者，首先征服（conquer）你自己。”
书面表达参考答案（One possible version）
The Chinese star gymnast and former Olympic gold medali
www.89xue.com st, Liu Xuan, is now studying in Peking University. She’s chosen to study journalism. She got interested in journalism as a result of her contacts with reporters when she was a gymnast. And also, she believes that studying journalism will help her to learn as much knowledge as possible in many kinds of fields, such as politics, economics, history and culture. She wants to be an international gymnastics referee in the future. She believes in this motto: “First conquer yourself if you want to be a winner.”
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