According to the study by the Institute of Psychology in Stockholm, overwork is likely to induce some diseases.

A . the ship's officers B . the foreman from the shore C . the ship's hands D . the tally ma

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 (打盹) 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 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. lockout 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 a companion 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 (冰山) ". He speculates that more examples may turn up when we take a closer look at other species. A new study on birds' sleep has revealed that ______ A．half-brain sleep is found in all kinds of birds B．half-brain sleep is characterized by accelerated brain waves C．birds can control their half-brain sleep consciously D．birds always sleep with the whole of their brain at rest

A．complete indifference. B．qualified acceptance. C．skeptical amusement. D．perplexed astonishment.

A．give up unnecessary property. B．add more to their material possession. C．get desirable commodities. D．change their living conditions.

A．the adoption of a policy of aggressive predator elimination. B．the increased number of National Parks. C．the deceasing number of visitors to National Parks. D．the heavy exploitation of endangered animals in the 20 century. 此题为多项选择题。

[A]jobs and businesses [B] living expenses [C] change of life-styles [D] separation from adult children

A．balance engineering and the liberal arts B．receive guidance in their careers C．become noble idealists D．broaden their horizons 此题为多项选择题。

A．an evolutionary driving force. B．a conflict of interests. C．ecological factors. D．the quality of the offspring.

A．A.reasonable person standard B．B.legality of the contract C．C.doctrine of equity D．D.common law of contracts

A.Social distance B.Status distance C.Psychological distance D.Financial distance E. Educational distance 此题为多项选择题。

Although fiction assuredly springs from political circumstances, its authors react to those circumstances in ways other than ideological, and talking about novels and stories .primarily as instruments of ideology limits much of the fictional enterprise. Rosenblatt's literary analysis discloses relations and connotations among works of Black fiction which solely political studies have overlooked or ignored. Writing acceptable criticism of Black fiction, however, presupposes giving satisfactory answers to a number of questions. First of all, is there a sufficient reason, other than the racial identity of the authors, to group together works by Black authors？ Second, how does Black fiction make itself distinct from other modern fiction with which it is largely contemporaneous？ Rosenblatt's idea shows that Black fiction constitutes a distinct body of writing that has an identifiable, coherent literary tradition. Looking at novels written by Blacks over the last eighty years, lie discovers recurring concerns and designs independent of chronology. These structures are thematic, and they spring, not surprisingly, from the central fact that the Black characters in these novels exist in a predominantly White culture, whether they try to conform. to that culture or rebel against it. Black Fiction does leave some aesthetic questions open. Rosenblatt's thematic analysis permits considerable objectivity; he even states that it is not his intention to judge the merit of the various works--yet his reluctance seems misplaced, especially since an attempt to appraise might have led to interesting results. For instance, some of the novels appear to be structurally diffused. Is this a defect, or are the authors working out of, or trying to create, a different kind of aesthetic？ In addition, the style. of some Black novels, like Jean Toomer's Cane, verges on expressionism or surrealism; does this technique provide a counterpoint to the popular theme that describes the fate against which Black heroes are struggling, a theme usually conveyed by more naturalistic modes of expression？ In spite of such omissions, what Rosenblatt does include in his discussion makes for a keen and worthwhile study. Black Fiction surveys a wide variety of novels, bringing to our attention in the process some fascinating and little-known works like James Weldon Johnson's Autobiography of an Ex-Colored Man. Its argument is tightly constructed, and its forthright, clear style. exemplifies levelheaded and penetrating criticism. Roger Rosenblatt looked at Addison Gayle's criticism of Black Fiction with a (n) __ attitude. A．disapproving B．consenting C．objective D．cautious

1. 目前出国留学现象很普遍 2. 形成这种现象的原因及不同人对此的看法 3. 我的观点 Overseas Studying

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A．They bury measuring device 3 kilometers under the volcano floor. B．They observe carefully the change of the mountain's position. C．They also observe activities of the earth when it changes. D．Devices are placed within 20 kilometers of Mount St．Helens.

A．Spanking is added to be one of the factors affecting children"s acts. B．Aggression of children will be given a serious study in later research. C．Corporal punishment should be forbidden both at home and in school. D．It adds credibility to the appeal of stopping punishing children physically.