2020届高考英语备考 专题17 阅读理解之说明文（无答案）

时间限制训练阅读理解说明1.湖北圈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 out sid E the sleping bag。if you leave your arms out，they float free in zero gravity，Often giving a sleping astront the look of a funny balled(芭蕾)dancer。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 for the American astrons has no handle bars。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 residence have To be careful about staying in one place too long . without gravity To help circulate air，The carbon dioxide you exhaleyou can end up with what astrons call a carbon-dioxide headhache。Leroy Chiao，54，an American retired astront after four flights，describes what happens even before you float out of your seat，mean nwhile your eyes are telling you re standing straight。that can be annoying-that s why some people feel Sick。within a couple days-truly terrible days for some-astroauts brains learn to ignore the panicky sigals from the inner ear，and spacespace travel can be so delivet ful but at the same time invisiby dangerous。for instance，Astrons lose boneh . that s why exercise is consired so vital that national aerons and space administration(NASA)putionthe focus on fitness is as much about science and the future as it is about keeping any individual astrons r Etern home，and，more importantly1.what is the major challenge to astrons when they sleep in space？A.deciding on a proper sleep positionB.choosing a comfortable sleping bagC.seeking a way to fall asleep quicklyD.Finding a right time to go to sleep。2.the astroauts will suffer from a carbon-dioxide head hache when _ _ _ _ _ _。A.the y circle around on their bikesB.they use micro computer s without a stopC.they exercise in one place for a long timeD.they watch a movie while pedaling3.some astroauts 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 uneexpectedlyD.whether they are able to go back to the station4.one of the NASA s major concerns about astrons is _ _ _ _ _ _ _。A.how much exercise they do on the stationB.how they can remain healthy for long in spaceC.whether they可以恢复after returning homeD.whether they are able to go back to the station2.陕西the production of coffee beans is a huge、profitable business、but、unfortunately、Full-sun production is taking over the iningthe change in how coffee is grown from shade-grown production to f Ull-sun production endangers the very existence of，cerain animals analsOn a local level，The damage of The forest required by full-sun fields affects The area s 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 growers destroy this forest home。as a result，many special are quickly dying out。On a more global level，The destruction of The rain forest for full-sun coffee fields also throttens(威胁)Humanlife.medical researchBoth locally and globally，The continued spread of full-sun coffee plantions(农场)Could mean The destruction of The rain forest ecoodthe loss of shade trees is already causing a slight change in the worlds climate，And studies show that loss of oxygen-giving trees also leadsit is obvious that 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 paragraph 4？A.it limits the spread of new growing techniques。B.it leads to air pollution and global warming。C.it slows down the loss of shade trees .D.it improves local soil conditions。2.the purpose of the text is to _ _ _ _ _ _。A.entertainB.advertiseC.instructD.persuade3.where does this text probaby come from？A.An agricultural magazine。B.A medical journal。C.An engineering textbook。D.tourist guide。4.which of the following shows the structure of the whole text？3.四川their cheery song brights many a winters day。but robins are in danger of wearing themselves out by singing too much。robins are