《高考英语备考 专题17 阅读理解之说明文（无答案）》由会员分享，可在线阅读，更多相关《高考英语备考 专题17 阅读理解之说明文（无答案）（7页珍藏版）》请在金锄头文库上搜索。
1、限时训练阅读理解之说明文1. 【湖北卷】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 f
2、loat free in zero gravity, often giving a sleeping astronaut the look of a funny balled （芭蕾）dancer. “Im an inside guy,” Mike Hopkins says, who returned from a six-month tour on the International Space Station. “I like to be wrapped up.”On the station, the ordinary becomes strange. The exercise bike
3、for the American astronauts has no handlebars. It also has no seat. With no gravity, its just as easy to pedal violently. You can watch a movie while you pedal by floating a microcomputer anywhere you want. But station residents have to be careful about staying in one place too long. Without gravity
4、 to help circulate air, the carbon dioxide you exhale (呼气) has a tendency to form an invisible （隐形的）cloud around you head. You can end up with what astronauts call a carbon-dioxide headache.Leroy Chiao, 54, an American retired astronaut after four flights, describes what happens even before you floa
5、t out of your seat,”Your inner ear thinks yourre falling . Meanwhile your eyes are telling you youre standing straight. That can be annoyingthats why some people feel sick.” Within a couple days truly terrible days for some astronauts brains learn to ignore the panicky signals from the inner ear, an
6、d space sickness disappears.Space travel can be so delightful but at the same time invisibly dangerous. For instance, astronauts lose bone mass. Thats why exercise is considered so vital that National Aeronautics and Space Administration (NASA) puts it right on the workday schedule. The focus on fit
7、ness 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.1.What is the major challenge to astronauts when
8、 they sleep in space?A. Deciding on a proper sleep positionB. Choosing a comfortable sleeping bagC. Seeking a way to fall asleep quicklyD. Finding a right time to go to sleep.2.The astronauts will suffer from a carbon-dioxide headache when _.A. the y circle around on their bikesB. they use microcomp
9、uters without a stopC. they exercise in one place for a long timeD. they watch a movie while pedaling3.Some astronauts feel sick on the station during the first few days because _.A. their senses stop workingB. they have to stand up straightC. they float out of their seats unexpectedlyD. whether the
10、y are able to go back to the station4.One of the NASAs major concerns about astronauts is _.A. how much exercise they do on the stationB. how they can remain healthy for long in spaceC. whether they can recover after returning homeD. whether they are able to go back to the station2. 【陕西】The producti
11、on of coffee beans is a huge, profitable business, but, unfortunately, full-sun production is taking over the industry and bringing about a lot of damage. The change in how coffee is grown from shade-grown production to full-sun production endangers the very existence of, certain animals and birds,
12、and even disturbs the worlds ecological balance.On a local level, the damage of the forest required by full-sun fields affects the areas birds and animals. The shade of the forest trees provides a home for birds and other special(物种) that depend on the trees flowers and fruits. Full-sun coffee growe
13、rs destroy this forest home. As a result, many special are quickly dying out.On a more global level, the destruction of the rainforest for full-sun coffee fields also threatens(威胁)human life. Medical research often makes use of the forests plant and animal life, and the destruction of such species c
14、ould prevent researchers from finding cures for certain diseases. In addition, new coffee-growing techniques are poisoning the water locally, and eventually the worlds groundwater.Both locally and globally, the continued spread of full-sun coffee plantations (种植园)could mean the destruction of the ra
15、inforest ecology. The loss of shade trees is already causing a slight change in the worlds climate, and studies show that loss of oxygen-giving trees also leads to air pollution and global warming. Moreover, the new growing techniques are contributing to acidic(酸性的) soil conditions.It is obvious tha
16、t the way much coffee is grown affects many aspects many aspects of life, from the local environment to the global ecology. But consumers do have a choice. They can purchase shade-grown coffee whenever possible, although at a higher cost. The future health of the planet and mankind is surely worth more than an inexpensive cup of coffee.1. What can we learn about full-sun coffee production from
