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1、Unit 3 Inventors and inventions .阅读理解AHumans have launched themselves into the outer space. Theyve landed on the moon. Theyve built habitable space stations that orbit the Earth. The next giant leap for mankind is to reach another planetspecifically, Mars.The problem is that its no easy task. The pl
2、anet is 586 times further away from the Earth than the moon, and itll take around 180 to 220 days to reach Mars, depending on where each planet is in its orbit. Such long periods in space have suggested many potential health problems, including hormonal changes, skin conditions, and muscle and bone
3、deterioration(损耗)Heres where some furry friends come in. A wide range of animals have been in space, from fruit flies and spiders to cats, and dogs. Such experiments began as far back as the late 1940s in first tests to see if living things could withstand the extreme gforce(重力) of a rocket launch.M
4、ice continue to play a very important part in space experiments, mainly because the animals make excellent test subjects. Theyre small, which makes them inexpensive and easy to care for. In addition, their size and short life span make it possible to do the equivalent of several human years of tests
5、 in a much shorter time. Finally, because mice are mammals, they share many common characteristics with humans in terms of genetics, biology and behavior.Astromice have hit the headlines recently, as a team of scientists led by Betty Nusgens, professor of biology at the University of Liege in Belgiu
6、m, found that the mice suffered a 15 percent thinning of their skin after 91 days aboard the International Space Station(ISS)This experiment was part of a wider NASA mission(任务) called the Mice Drawer System(MDS). The Italian Space Agency developed the facility, which allows six mice to be housed, m
7、onitored, and automatically fed and watered aboard the ISS, among which three survived during the mission. The mice have participated in 20 separate experiments, to study such effects as osteoporosis (骨质疏松症), anemia(贫血) and heart health.Results for the 20 experiments are coming in gradually. But its
8、 clear that mice continue to play an important role in the ongoing quest to conquer the final frontier.语篇导读本文为说明文。人类从未停止对未知的探索，继人类踏上月球之后，人类开始探索去往火星的旅程。1We can infer from Paragraphs 23 that _.AMars is the farthest planet away from Earth discovered so farBthe journey to Mars could put humans health at
9、 riskCit was in the late 1940s that animals were first sent to the ISSDanimals that have been sent into space have mostly survived解析 B推理判断题。根据第二段最后一句可知，正是因为去往太空可能会有这些健康问题，所以第三段写到要先用小动物来做实验，故选B项。2The underlined word “withstand” in Para.3 means _.Aset upBhold upCwork outDcome across解析 B词义猜测题。根据画线词所在句子
10、可知，这些实验早在20世纪40年代就开始了，第一个实验是观测生物是否能够忍受火箭发射的巨大重力。hold up支持住；承受住，故选B项。3According to Betty Nusgens and her team, the mice aboard the ISS _.Asuffered the loss of part of their skin Ball survived for the duration of the missionCwere fed and watered by the astronauts Dparticipated in 20 experiments that m
11、ade great breakthroughs解析 A细节理解题。根据第五段可知，在国际空间站待了91天后，这些老鼠的皮肤变薄了15%，故选A项。4The main purpose of the article is to _.Adescribe the role mice play in scientific researchBreport on the results of the Mice Drawer SystemCanalyze how mice could pave the way to MarsDchange peoples traditional attitudes towar
12、d mice解析 C写作意图题。文章主要讲述了为检测人类在去往火星探索的旅程中可能遭受的身体损害，需要用小动物来做实验，而在众多小动物中，老鼠被认为是最适合的，因此老鼠为人类通向火星奠定了基础，故选C项。BWhat do you do when you need to look something up? Go to the library? Open an encyclopedia(百科全书)? Click onto the Internet? These days, most people go straight to Wikipedia, the online encyclopedia.
13、 But how reliable is it?There is no denying the popularity and usefulness of Wikipedia. It attracts as many as 78 million visitors every month, and the site is available in more than 270 different languages. Its one of the most comprehensive resources available, which includes almost all details, fa
14、cts and information that may be concerned. Its got much more information than an ordinary encyclopedia. The site is updated on a daily basis by thousands of people around the world. Anyone with an Internet connection can log on and edit the contents or add a new page. And you dont need any formal tr
15、aining.Of course, there are some controls. Wikipedia has a team of more than 1,500 administrators who check for false information. And main targets for harmful comments (such as politicians) are offlimits to public editing. But with more than 16 million articles to keep an eye on, it isnt easy. So,
16、while Wikipedia benefits from being constantly updated with information from all over the world, its also open to “vandals”(破坏他人财产者)Some of the damage is easy to notice. One person drew devil horns and a moustache on Microsoft chairman Bill Gates photo, while another edited Greek philosopher Platos biography to say he was a “Hawaiian we
