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1、邢唷? ?NP?M欹? ;餜?Ibjbjk?2L?G?hhhhhhh|?8?TL|tt? - - - - - - $eR?fB?h?Bhh?h?h? ? .?|hht?h0$?j ?0 Z ?u$t|hhhh 4Q$ht?BB|D?|?桘?t銐桘?N R 韜噀 v(u 駛韹轛 T顣槝qQ2 0 R韜噀 11 0 RI no n ey e a rt h ew o r l du s e sa smu c he n e r g ya st h a tc o n t a i n e di n2 1b i l l i o nb a r r e l so fo i l .A n dth ea m o u
2、n to ff u e ln e e d e di sg r o wi n gr a p i d l y .T h es u p p l i e so ff o ss i lf u e l s c o a l ,o i l ,a n dg a s a r el i m i t e d .T h e ym a yn o tl a s tfor a century. Then what will take their place?For the answer, let 抯 look to the sky. Each day the sun showers the world withseveral
3、 thousand times as much energy as man uses. Here, in a sense, energy is unlimited.The sun 抯 energy is free for the taking. If man could capture even a small part ofthe sun 抯 energy at low cost, no one would worry about running out of nonrenewablefuels.If scientists succeed in making use of the power
4、 of the sun, this new energy willhave many different uses. The sun 抯 energy can be used in your own house for heatingand cooking.Then the sun can also be used as a source of fuel for power plants. Solar energycan be used in telephone communication, in space travel, and in farming.One of the practica
5、l problems in controlling solar energy is making it continuous.What can be done when the sun is not shining on the heating system? If you were usinga solar pump for irrigation, the interruption would not matter, since plants do notneed a continuous supply of water in the night time. But suppose you
6、were heating yourhouse by solar energy, a number of experimental houses that are heated in this way usestorage tanks to hold the heat for night time and rainy spells, or they must havesupplementary heating supplied by ordinary fuels.Once the sun 抯 energy is captured, the supply of energy will be end
7、less. No wonderthose who look to the sky see there great changes in our future way of life.Questions:What is this passage mainly about?What will replace fossi lf u e l si nt h ef u t u r e ?W h a tp r o b l e mm a ya r i s ew h e ns o l are n e r g yi su s e dt oh e a tt h eh o us e ?H o wc a ns o l
8、 a re n e r g yb es t o r e dfo rc o n t i n u o u su s e ?W h a tc a nb ee x p e c t e do fo u rl i f ei nt h ef u t u r ei ft h es u n se n e r g yi sw i d e l yu s e d ?韜噀 21 0 RS u p e r c o n d u c t i v ity means no electrical resistance,and that in turn means no wasted power. Till now, alumin
9、um and copper cables have carriedelectricity from the power stations where it is generated to the factories, officesand homes that use it. By the time main electricity reaches your home, more than 10per cent of the power that was fed into the grde applications before it reaches thesupermarket shelf.
10、 I am sure chemicals and their role in disease will become a big issuein the next century as the population of the developed world worries increasingly aboutits health.The reason GM food will not go away is that we need a three-fold increase in foodproduction by the year 2050 to keep pace with the w
11、orld 抯 predicted population growthto ten or eleven billion. It is not just a question of more mouths to feed either. Whatisoftenforgottenistha ta l lt h e s ee x t r ap e o p l ew i l lt a k eu ps p a c e ,r e d u c i n gt h eo v e ra l ll a n da v a i l a b l ef o ra g r i c u l t ur e .韜噀 2AB $N 莧
12、韜噀鸑 恦 Q N2 5 RA .T h e r ei sg r o w i n gr e c o g n i t i o no fb r o a do p p o r t u n i t i e sf o rt h ea p p l i c a t i o no fc h e m i s t r ya n dc h em i c a le n g i n e e r i n g .C h e m i s t r y ,i nt e r a c t ing with other disciplines, provides the fundamental knowledgerequired to
13、 deal with many of society抯 needs. These include new materials for aerospace,automotiveandelectronicindustries;basicdataforthedesignofeffectiveenvironmental controls; and the understandingof life processes importance toagriculture and health care. A report by the National Academy of Sciences entitle
14、d 揙pportunities in Chemistry?helps us to crystalize our thoughts about the centralimportance of chemistry and chemical engineering and the wide bounds of theirapplication.The maturing of commodity chemicals, plastics and apparel fibers businesses;growing international competition; and problems with
15、environmental quality and toxicmaterials have led many to a defensive view of our industry. If we are not careful sucha view could stultify creativity. In point of fact, the opportunities are bright fornew businesses based on the chemical sciences. But to take advantage of theseopportunities, we mus
16、t be prepared to depart from traditional fields into new areas.B.Solids always offer resistance to deformation in one degree or another. They keeptheir own size as well as their own shape. They do not change their shape when theymove from one place to another. Solids do not flow at all in the ordina
17、ry way, evenover hundreds of years; they will do so only under enormous pressure. Solids are, onthe whole, less compressible, though a very high pressure all round can squeeze theminto somewhat less space.Unlike solids, liquids have no fixed shape of their own. But they possess a freesurface. When a
18、 liquid is put into a vessel, it lies evenly in that vessel with a levelsurface on top, and adapts itself to the shape of the vessel. It is cylindrical if thevessel is a cylinder; it is cubical if the vessel is a cube. Compared with solids, liquidsare a bit more compressible. If a steel cylinder is
19、full of water, we still can makealittlemorewatergoinundergreatpressure.Liquidsflowtoo;*,248:DFHJL?./GHZop?78?黝麋麋鬢麋移浩殦崜?唝唝唕唊哾 k hl-? CJo( h3 ? CJo( h.cP CJo( hA5 CJ h? CJo( hA5 CJo( h 鳱 l CJ h鳱l CJo( hE(? h.cP CJaJ h?$? CJaJo( hE(? h;? CJaJo( hE(? hl-? CJaJo( hE(? hoC? CJaJo( hE(? h.cP CJaJo( hoC? 5丆
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22、h?I h瘇9 5丆JaJo( h?I h.cP 5丆JaJo( h?G h6? CJaJo( h?_ CJaJo( U h1Oh CJaJo( h? CJaJo( h? CJaJo( h 齩? CJaJo( h? CJaJo( h? CJaJo(*b u ts o m ef l o wm uc hm o r ee a s i l yt h a no t h e r s .W h a te v e rl i q u i dw ee x p e r i m e n tw i t h ,h o w e v e r ,w ew i l lf i n dt h a ti tf lo w sm o r
23、ee a s i l yw h e nh o tt h a nw he nc o l d .Il 褘駛 N R 錝 P0 祂=勓?b 駛韹qQ3 0 R錝 P?褘1 0 R5u 亸?Y 颯翂騗蟸 b:N 篘霳錯 8u;m-N 臺N 颯 剉錧 wQ 0購*N 顣槝O b 霳 a0R 餠裛 b 霳 N 魐(W錘 Blb0RTHh 0ir(?NLu 鄀簨裇 u 繬 HN 豐 S購汵豐 S 龕/f1uyr 妅剉*NSO9hnc 袕膲媉蹚 L 垊 v 0蟸 Nm 剉裇 UN N 祂鰁魰匭N*N 齎禰罷Ng剉篘 GW 齎 lu;P 剉瀀?gsQ 0祂=匊褘1 0 R郪 yrQ/f N*N 迯vQ 諲梴:g
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