单选题This research has attracted wide ______ coverage and has featured on BBC television' s Tomorrow' s World. A. message B. information C. media D. data

单选题What did women do since they were not allowed to participate in the Olympics?

单选题Mr. Smith can be quite sad ______ , though in public he is extremely cheerful.

单选题Customs Officer: Good morning. May I see your visa, please? Tourist: ______ A. No problem, take it. B. Here, you may have it. C. Yes, give you. D. Sure, here you are.

单选题Whatever the causes, English at the end of the 20th century is more widely spoken and written than any other language ______. A. ever was B. had ever been C. has ever been D. would ever be

单选题Even plants can run a fever, especially when they're under attack by insects or disease. But unlike humans, plants can have their temperature taken from 3,000 feet away --straight up. A decade ago, adapting the infrared 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 40 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 if Paley finds the financial backing which he failed to obtain 10 years ago.

单选题The government______regulations that put this old city under protection. A. published B. issued C. discharged D. released

单选题The biggest safety threat facing airlines today may not be a terrorist with a gun, but the man with the portable computer in business class. In the last 15 years, pilots have reported that well over 100 incidents could have been caused by electromagnetic interference. The source of this interference remains unconfirmed, but increasingly, experts are pointing the blame at portable electronic device such as portable computers, radio and cassette players and mobile telephones. RTCA, an organization which advises the aviation (航空) industry, has recommended that all airlines ban (禁止) such devices from being used during "critical" stages of flight, particularly take-off and landing. Some experts have gone further, calling for a total ban during all flights. Currently, rules on using these devices are left up to individual airlines. And although some airlines prohibit passengers from using such equipment during take-off and landing, most are reluctant to enforce a total ban, given that many passengers want to work during flights. The difficulty is predicting how electromagnetic fields might affect an aircraft"s computers. Experts know that portable device emit radiation which affects those wavelengths which aircraft use for navigation and communicatioa But, because they have not been able to reproduce these effects in a laboratory, they have no way of knowing whether the interference might be dangerous or not. The fact that aircraft may be vulnerable (易受损的) to interference raises the risk that terrorists may use radio systems in order to damage navigation equipment. As worrying, though, is the passenger who can"t hear the instructions to turn off his radio because the music"s too loud. (275 words)

单选题They have all got up, and ______. A. Jack has too B. so has Jack C. also has Jack D. Jack hasn't

单选题As people continue to grow and age, our body systems continue to change. At a certain point in your life your body systems will begin to weaken. Your joints may become stiff. It may become more difficult for you to see and hear. The slow change of aging causes our bodies to lose some of their ability to bounce back from disease and injury. In order to live longer, we have always tried to slow or stop this process that leads us toward the end of our lives. Many factors contribute to your health. A well-balanced diet plays an important role. The amount and type of exercise you get is another factor. Your living environment and the amount of stress you are under is yet another. But scientists studying senescence (衰老) want to know: Why do people grow old? They hope that by examining the aging process on a cellular level medical science may be able to extend the length of life.

单选题At the resorts tourists may do the following except ______.

单选题Man: ______ Woman: No...but it's a non-smoking section, I'm afraid.

单选题I'd rather you ______ make any comment on the issue for the time being. A. don't B. wouldn't C. didn't D. shouldn't

单选题奥地利作曲家海顿创作的《创世纪》，是一部( )作品。

单选题A: What a surprise. You had your hair permed. B: Yes, and another surprise. I"m going to get married next Saturday. A: ______

单选题Understanding (the) culture of another country, especially (the one) containing as (many) different nationalities (as) China, is a difficult task.

单选题When he finished all the items on the test paper, he ______ the answers carefully.

单选题The boy burned with ______ to know what was in the letter addressed to his sister. A. interest B. curiosity C. desire D. wish