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Paragraph Seven Most scientists start an investigation by finding out what other scientistshave learned about a particular problem. After known facts have been gathered,the scientist comes to the part of the investigation that requires considerableim
2024年08月13日 00时08分02秒
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Paragraph Eight A control box fitted to the car contains a mini-cellphone, a micro-processorand memory, and a GPS satellite positioning receiver. Ifthe car is stolen, a codedcellphone signal will tell the control center to block the vehicle's enginem
2024年08月13日 00时08分01秒
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Paragraph Nine Parents in low-income countries fail to invest in their daughters becausethey do not expect them to make an economic contribution to the family: girlsgrow up only to marry into somebody else's family and bear children. Girls are thus s
2024年08月13日 00时08分59秒
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Paragraph Ten Lack of interest can also lead to absent-mindedness. A man who can recitesports statistics from 30 years ago may not remember to drop a letter in themailbox. Women are slightly better than men in this respect, possibly becausethey pay m
2024年08月13日 00时08分58秒
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It's early August and the countryside appears peaceful. Planting has longbeen finished and the fields are alive with strong, healthy crops. Soybeans andwheat are flourishing under the hot summer sun, and the com is now well over sixfeet tall. 46.( He
2024年08月13日 00时08分57秒
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The tranquility of the above scene is misleading. Farmers in the Midwestput in some of the longest workdays of any profession in the United States. Inaddition to caring for their crops and livestock, they have to keep up with newfarming techniques, s
2024年08月13日 00时08分56秒
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This productivity, however, has its price. Intensive cultivation exposes theearth to the damaging forces ofnature. Every year wind and water remove tons ofrich soil from the nation's croplands, with the result that soil erosion has become anational p
2024年08月13日 00时08分54秒
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So far, farmers have been able to compensate for the loss of fertile topsoilby applying more chemical fertilizers to their fields; however, while this practicehas increased crop yields, it has been devastating for ecology. 49.( Agriculture hasbecome
2024年08月13日 00时08分53秒
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Clearly something else has to be done in order to avoid an eventualecological disaster. Conservationists insist that the solution to the problem lies innew and better farming techniques. 50.( Concerned farmers are building terraceson hilly fields, ro
2024年08月13日 00时08分52秒
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2024年08月13日 00时08分50秒
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2024年08月13日 00时08分49秒
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2024年08月13日 00时08分44秒
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