短文填空

　　Jumping rope is an activity any student can learn to do. You can help turn a 1 rope for many others to jump o 2 , one at a time. If you jump alone, you will need a short rope w 3 should be just long enough for your height. T 4 ropes of different lengths until you find o 5 which fits your size.

　　A rope should be turned slowly. It must also be turned h 6 enough to let you jump freely and safely. T 7 the rope freely and safely requires careful timing. In rope jumping, timing m 8 turning the rope slowly enough so that you can jump at the r 9 time without it striking your f 10 .

1．________ 2．________ 3．________ 4．________ 5．________

6．________ 7．________ 8．________ 9．________ 10．________

完形填空

　　Harriet Tubman was born a slave. She didn't get a 1 to go to school. 2 a child, she had to work very hard in the fields all day. In this 3 her master could 4 a lot of money when he 5 his crops. Harriet 6 , think that she was being treated fairly. After Harriet grew up, she ran away from the farm to the northern states. 7 , and in Canada, black people were free. Harriet liked to be free, she felt 8 for all of the black people who were 9 slaves. Harriet returned to the south W help other slaves to run away. She made sure they got to 10 .

　　Harriet was in great 11 12 a law that had just been passed. The law 13 it was not permitted to 14 slaves run away. She also found out 15 the slave owners said they would pay $40,000 to anyone who could catch H. Tubman.

　　There were many stories about Harriet 16 , slaves run away . In all, she made nineteen 17 back to the south and led about 300 slaves to freedom. When the Civil War broke out, the northern states 18 against the southern states. Harriet 19 the northern states because the northerners believed that slaves should be free. She worked as a nurse and spied 20 enemy lines until the northern states won the war.

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　　Even plant can run a fever, especially when they’re under attack by insects or disease. But unlike human, plants can have their temperature taken from 3, 000 feet away - straight up. A decade ago, adopting the infrared （红外线）scanning technology developed for military purposes and other satellites, physicist Stephen Paley came up with a quick way to take the temperature of crops to determine which ones are under stress. The goal was to let farmers precisely target pesticide （杀虫剂）spraying rather than rain poison on a whole field, which invariably includes plants that don’t have pest （害虫）problems.

　　Even better, Paley’s Remote Scanning Services Company could detect crop problems before they became visible to the eye. Mounted on a plane flown at 3, 000 feet at night, an infrared scanner measured the heat emitted by crops. The data were transformed into a color - coded map showing where plants were running“ fevers”. Farmers could then spot - spray, using 50 to 70 percent less pesticide than they otherwise would.

　　The bad news is that Paley’s company closed down in 1984, after only three years. Farmers resisted the new technology and long - term backers were hard to find. But with the renewed concern about pesticides on produce, and refinements in infrared scanning, Paley hopes to get back into operation. Agriculture experts have no doubt the technology works. “This technique can be used on 75 percent of agricultural land in the United States, ” says George Oerther of Texas A & M. Ray Jackson , who recently retired from the Department of Agriculture, thinks remote infrared crop scanning could be adopted by the end of the decade. But only ff Paley finds the financial backing which he failed to obtain 10 years ago.

　56．Plants will emit an increased amount of heat when they are________.

　　A. sprayed with pesticides     B. facing an infrared scanner

　　C. in poor physical condition   D. exposed to excessive sun rays

　57．In order to apply pesticide spraying precisely, we can use infrared scanning to________.

　　A. estimate the damage to the crops    B. measure the size of the affected area

　　C. draw a color -coded map          D. locate the problem area

　58．Farmers can save a considerable amount of pesticide by________.

　　A. resorting to spot – spraying   B. consulting infrared scanning experts

　　C. transforming poisoned rain    D. detecting crop problems at an early stage

　59．The application of infrared scanning technology to agriculture met with some difficulties________.,

　　A. the lack of official support        B. its high cost

　　C. the lack of financial support      D. its failure to help increase production

　60．Infrared scanning technology may be brought back into operation because of________.

　　A. the desire of farmers to improve the quality of their produce

　　B. growing concern about the excessive use of pesticides on crops

　　C. the forceful promotion by the Department of Agriculture

　　D. full support from agricultural experts