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me invisibly dangerous. For instance, astronauts lose bone mass. That39。根據(jù)第三段中 “But station residents have to be careful about staying in one place too long. ...You can end up with what astronauts call a carbon173。故選 D項。t know how to take exercise. Many students are in a poor health because they don39。s major concerns about astronauts is ________. A. how much exercise they do on the station B. how they can remain healthy for long in space C. whether they can recover after returning home D. whether they are able to go back to the station 答案與解析: B 細(xì)節(jié)理解題。故選 C項。本文通過舉例說明了太空生活的奇妙:在太空睡覺時,對宇航員來說主要的挑戰(zhàn)在于恰當(dāng)?shù)乃咦藙?,最后告訴我們美國國家宇航局對宇航員主要的擔(dān)心是宇航員回家后的修養(yǎng)期和如何在太空長久地保持健康。 B The oddness of life in space never quite goes away. Here are some examples. First consider something as simple as sleep. Its position presents its own challenges. The main question is whether you want your arms inside or outside the sleeping bag. If you leave your arms out, they float free in zero gravity, often giving a sleeping astronaut the look of a funny balled(芭蕾 )dancer. “I39。t miss 標(biāo)題下的第 二個,減免30%的 Tanya語言學(xué)校的課程費用,故選 D。A free notebook with every purchase above $50 at Starlight Stationery 3. He fell asleep with ________ ________ ________. 燈還亮著他就睡著了。s estimated that from 7. Not。 of through 39。 2. In primary schools, ________ ________ ________ ________ better understanding of the knowledge of puters. 小學(xué)階段,需要有對電腦知識的更好的理解。20% off any purchase made at Ruby Bookstore 根據(jù) benefits you can39。故選 A。s why exercise is considered so vital that National Aeronautics and Space Administration(NASA) puts it right on the workday schedule. The focus on fitness is as much about science and the future as it is about keeping any individual astronauts return home, and, more importantly, how to maintain strength and fitness for the two and a half years or more that it would take to make a round- trip to Mars. 【語篇解讀】 這是一篇說明文。dioxide headache” 可知宇航員在一個地方運動久了會出現(xiàn)碳毒性頭痛。 7. One of the NASA39。t take enough exercise. We should realise the importance of taking exercise and do something to improve the present situation.