21．What do you guess the word“piggy - back” means in the first item of news?

　A. Greedy.　　 B. Large.　　C. Dependent.　 D. Fragile.

20．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

No. 6

　London, (UPT via Xinhua)- Peter Scott, a 51 - year - old printer from northern England, has been given his second of two “piggy -back” hearts after removing of his own heart, the Hare filed Hospital said last week.

　The hospital near London, which is specially good at heart operation, said Scott was in a satisfactory condition.

　Doctors first linked Scott’s heart with the heart of a 13year - old girl in a “piggy -back” transplant (移植)to make up this own heart a week before, the hospital director David Blythe said.

　Both beat well in step for four days until half - solid blood formed in a man - made valve (瓣膜)fixed in Scott’s own heart last year, Blythe said.

　MOSCOW(Agencies via Xinhua)- A Russian Ilyushin62 airliner left for West Africa suddenly fell down shortly after take - off here, killing everyone on board.

　It is not known how many passagers the 182 - seat aircraft was carrying when it went downward quickly to the ground just 10 kilometres from Sheremetyevo Airport.

　But west African newspapers said the plane, which was heading for Sierra Leone, was about half full.

　An official from Moscow’s Botkin Institute Hospital said, “No one could have been still alive in the accident. ”

　“The accident was so serious, so horrible, that we did not need to give medical attention to anyone.”

　West African officials have complained that the Russian government failed to inform them of the air accident, in which many Africans may have been killed.

　Stavanger, Norway, March 28(AFP)-At least 28 oil workers died and 69 were missing today after the overturning of the 10, 000 ton Norwegian “Floating Hotel” Alexander Kiellan, in strong winds last night.

　Another 128 workers have reportedly been rescued from the icy, storm- thrown North Sea waters midway between northeast England and Denmark in continuing search operations by British and Norwegian helicopters, planes and ships.

　The disaster, called“the worst in our recent history” by Norwegian Premier Odvar Nordli, struck late yesterday when the four - level platform, used as a rest area for workers in the Nor the Seas Ekofisk Oil Field, overturned in a storm after one of its five huge legs gave way for unknown reasons. Yet the quality of construction was the last, Ken Harris, Chief Engineer said.

　In Stavanger, Prime Minister Nordli thanked neighboring countries, with England heading the list, for their aid and in the rescue effort.

　The Ekofick field has the heaviest oil platforms of all of shore sites in the world, with 1, 850 oil workers on them, including three other rest platforms.

19．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

18．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

17．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

16．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

15．If you take the evening programmed at the International House, you will pay about________.

　A. 60 yuan　　B. 240 yuan　　C. 720 yuan　　 D. 960 yuan

No. 5

　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.

14．You will probably prefer to go to the International House because it________.

　A. offers free sightseeing and social activities

　B. has a special course in spoken English

　C. costs less than the other schools

　D. has native English teachers

13．The 21st Century is different from the other three schools in that________.

　A. its teaching quality is better

　B. it is nearest to the city center

　C. its courses are more advanced

　D. it requires an entrance examination

12．You work from 9︰00 a. m. to 4︰30 p. m. every day. Which school will you choose?

　A. Global English Center and Modem Language School.

　B. Global English Center and the International House.

　C. Modern Language School and the 21st Century.

　D. The 21st Century and the International House.