73. The underlined word“spin-offs” in Paragraph 4 probably refers to______.
A. survival chances
B. potential resources
C. unexpected benefits
D. physical possessions
74. What makes it possible for humans to live on other planets?
A. O ur genetic makeup.
B. Resources on the earth..
C. The adaptive ability of humans.
D. By-products in space exploration.
5.(2011·江苏卷)A
We know the famous ones—the Thomas Edisons and the Alexander Graham Bells —but what about the less famous inventors? What about the people who invented the traffic light and the windshield wiper(雨刮器)?Shouldn’t we know who they are?
Joan Mclean think so. In fact, Mclean, a professor of physics at Mountain University in Range, feels so strongly about this matter that she’s developed a course on the topic. In addition to learning “who”invented”what”, however, Mclean also likes her students to learn the answers to the”why” and ”how” questions. According to Mclean,”When students learn the answers to these questions, they are better prepared to recognize opportunities for inventing and more motivated to give inventing a try.”
So,just what is the story behind the windshield wiper? Well,Mary Anderson came up with the idea in 1902 after a visit to Mew York City.The day was cold and stormy, but Anderson still wanted to see the sights ,so she jumped aboard a streetcar. Noticing that the driver was struggling to see through the snow covering the winshield,she found herself wondering why there couldn’t be a built-in device for cleaning the window. Still wondering about this when she returned home to Birmingham, Alabama, Anderson started drafting out solutions. One of her ideas, a lever(操作杆)on the inside of a vehicle that would contrl an arm on the outside, became the first windshield wiper.
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