单选题About 79 million Americans have pre-diabetes（糖尿病前期）。That means they have blood sugarthats higher than normal but not high enough to be diagnosed（诊断）with type 2-at least not yet.One long-term stud

单选题The mayor of County Club Hills helped arrest two men Wednesday night suspected in the random shooting a 15-year-old boy as he was leaving a basketball game at Hillcrest High School. County Club Hills Mayor Dwight Welch, who is also a 27 police officer, said he 28 up around 9:30 p.m. to the rear parking lot of the high school, 17401 Pulaski Td., after hearing radio 29 of someone firing several shots at crowds leaving the game between Hillcrest and Rich Central High School. 'It was pretty 30 because no one knew where the shots were coming from,' Welch said later in a telephone 31 from his home. 'Within five minutes of being there we got a report that a student was shot.' Welch and on-duty police Lt. Will Garrison found a 15-year-old Hillcrest student had suffered a graze 32 to the arm. They boy was taken in good condition to Advocate South Suburban Hospital in Hazel Crest, said town spokeswoman Wanda Comein. No one else was hit. In Welch's police car, they began 33 the area for a white jeep that had fled the scene south on Winston Drive following the shooting, the mayor said. 'We stayed back and turned around and waited for them. Then we saw the suspects' car coming head-on,' Welch said. 'We curbed their 34 . We came close to crashing.' Once the car was stopped, Welch and the lieutenant got out of their vehicle and drew their service weapons, 35 the two occupants out of their vehicle, he said. Inside, they found a revolver next to an empty bottle of 36 , according to Welch. A. wound B. journalists C. certified D. ordering E. chaotic F. scouring G. employer H. liquor I. vehicle J. employee K. lie down L. pulled M. reports N. interview O. suspect

单选题 太空垃圾(space trash)是指那些绕着地球飞行的无用处的人造物体。这些物体在太空中不断碰撞，产生更多的太空垃圾，不仅给航天事业带来了巨大隐患，而且还污染了宇宙空间，给人类带来灾难。目前移除太空垃圾的方法主要有自然移除和人为移除，但效果都不理想。最好的方法就是从源头杜绝卫星成为太空垃圾的可能性，只有这样才能保证人类航天事业的可持续发展。

单选题She was so ______ in her job that she didn't hear anybody knocking at the door. A. attracted B. absorbed C. drawn D. concentrated

单选题It was sunrise on an August morning when the captain and his crew cast their nets some 50 miles south of Louisiana in the Gulf of Mexico. As the net was pulled over, the contents were poured out follo

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She was so______in her job that she didn" t hear anybody knocking at the door.

单选题When the air in a certain space is squeezed to occupy a smaller space, the air is said to be______.

单选题Woman: So, how are you getting along with Jane's cat? Man: Well, she never comes when I call her, she spills her food, and she sheds all over the place. I can't wait till Jane gets back. Question: What does the man imply?

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What do the words "remain stationary" mean in sentence 1, paragraph 4 of the passage?

单选题Families in frontier settlements used to entertain strangers ______.

单选题One weakness of this study may be ______.

单选题How do flying foxes care for the young ones? ( )

单选题It is (necessary) that the (customs) (of all) nations (must be respected).A. necessaryB. customsC. of allD. must be respected

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In mountainous regions, much of the snow that falls is Ucompacted/U into ice.

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