单选题What approach do the Futurists want us to adopt?

单选题

单选题I wish to have a friend with ______ shares my hobbies and interests.

单选题What does Jenny recommend to him?

单选题Birds that are literally half asleep--with one brain hemisphere alert and the other sleeping --control which side of the brain remains awake, according to a new study of sleeping ducks. Earlier studies have documented half brain sleep in a wide range of birds. The brain hemispheres take turns sinking into the sleep stage characterized by slow brain waves. The eye controlled by the sleeping hemisphere keeps shut, while the wakeful hemisphere's eye stays open and alert. Birds also can sleep with both hemispheres resting at once. Decades of studies of bird flocks led researchers to predict extra alertness in the more vulnerable, end of the row sleepers. Sure enough, the end birds tended to watch carefully on the side away from their companions. Ducks in the inner spots showed no preference for gaze direction. Also, birds dozing at the end of the line resorted to single hemisphere sleep, rather than total relaxation, more often than inner ducks did. Rotating 16 birds through the positions in a four duck row, the researchers found outer birds half asleep during some 32 percent of dozing time versus about 12 percent for birds in internal spots. "We believe this is the first evidence for an animal behaviorally controlling sleep and wakefulness simultaneously in different regions of the brain," the researchers say. The results provide the best evidence for a long-standing supposition that single hemisphere sleep evolved as creatures scanned for enemies. The preference for opening an eye on the lookout side could be widespread, he predicts. He's seen it in a pair of birds dozing side by side in the zoo and in a single pet bird sleeping by a mirror. The mirror side eye closed as if the reflection were accompanied and the other eye stayed open. Useful as half sleeping might be, it's only been found in birds and such water mammals (哺乳动物) as dolphins, whales, and seals. Perhaps keeping one side of the brain awake allows a sleeping animal to surface occasionally to avoid drowning. Studies of birds may offer unique insights into sleep. Jerome M. Siegel of the UCLA says he wonders if birds' half-brain sleep "is just the tip of the iceberg" He speculates that more examples may turn up when we take a closer look at other species.

单选题Generally, it is only when animals are trapped that they ______ to violence in order to escape. A. proceed B. appeal C. resort D. incline

单选题The law on no smoking in public is ______ stated.A. pertinentB. appropriateC. proportionatelyD. explicitly

单选题As a way of ______ the mails while they were away, the Johnsons asked the cleaning lady to send little printed slips asking the senders to write again later.

单选题Which of the following is NOT showing an increase this year?

单选题"Look at those pretty girls' skirts" is ______, because it is not clear whether the girls or the skirts are "pretty".A. ambiguousB. hiddenC. indirectD. indistinct

单选题Reading ______ the lines, I would say that the Government are more worried than they will admit. A.behind B.between C.along D.among

单选题Personally I think he's ______ the most original of all the contemporary fashion designers.[A] in all[B] by far[C] for all[D] at best

单选题If a housewife went on strike, which one of the following statements is NOT true?

单选题Alight with no more power than ______ by an ordinary electric light bulb becomes intensely strong as it is concentrated to a pinpoint-sized beam. A. as is produced B. that produced C. that is produced D. produced

单选题Compared with the work of Hamilton, what dose the author consider Fisher's work to be?

单选题The director ______ me as his official representative at the conference. A. nominated B. entrusted C. appeased D. regarded

单选题Fields found that when the bacteria accounted for 100 parts per million of the grain, the beetles' supercooling point ______.

单选题High speed was one of the factors causing the deadly train disaster in Zibo, Shandong Province, Xinhua said on Tuesday. The Monday train collision killed at least 71 and injured 416 others by the time of press. It occurred when a passenger train from Beijing derailed and collided with an oncoming train on the Jinan- Qingdao line. Xinhua reported that the train from Beijing was traveling at 131 kilometers an hour, in excess of the 80-kilometer-an-hour speed limit, before it came off the tracks. Authorities had on Monday ruled out terrorism and said "human error" was to blame. In 2006, China made up a quarter of the world's total railway transport volume, while its track length only made up six percent of the world's total, according to the Ministry of Railways. On such busy tracks, a small error can cause chaos. The Zibo accident is the worst in China since 1997 when 126 people were killed in Hunan Province. That year coincided with the decision to raise train speed limits in China. In 1997, most trains were running at a mere 60 kilometers per hour. Last April, China boosted its railway speed for the sixth time raising the top train speed by 25 percent to 200 kph. Necessary safety measures were adopted prior to the speedup. For example, on lines that carry trains traveling at 160 kph or faster, protective nets were erected on both sides to prevent animals or people from being "sucked" on to the tracks. But still there are problems according to experts. One is that China doesn't have a special track system for passenger trains, which have to run with the comparatively slow freights. This not only reduces the efficiency of the whole transportation system but also jeopardizes safety. High-speed trains require more sophisticated tracks with regards to steel strength and engineering structures. The 384km Jinan-Qingdao line will soon solely be used for freight. A special line for passenger trains will be finished before the Olympics. Zang Qiji, a ministry researcher, said that most track beds in China were designed for speeds of 120 km/h, and were upgraded to 160 km/h in 1998. Some still lack the capability to handle speeds of 200 km/h. However, train travel is still comparatively safe in China. The accident rate on railways is 1/24 of China's highway. According to the ministry, deaths on the track declined by 43. 8 percent in 2007 compared with figures from 2006. Human error is the primary cause of accidents, according to a survey from 1989 ～ 2001 published by the periodical Railway Transport and Economy. About 64.6 percent of track accidents were caused by human errors, while 13.8 from natural disasters, 12.3 by social unrest. Only 9.2 percent were caused by facilities.