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【单选题】
Ethe rn et局域网采用的媒体访问控制方式为什么A.
CSMA
B.
CSMA/CD
C.
CDMA
D.
CSMA/CA
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【单选题】Researchers are finding that______
A.
heart disease and cancer are the most common killers of human being
B.
blood pressure and brain function are decided by cycles of sun, moon and seasons
C.
the functions of human bodies have much to do with nature
D.
any change in human bodies goes systematically with changes in the environment
【单选题】(2018 ·湖北 5 月冲刺· 31)1984 年,邓小平在与中央有关负责人谈话时说到:“农村政策很有效,农村状况确实很好,我们需继续采取措施,使形势更好......”。 1990 年,邓小平提出:“从长远的观点,农村要有两次飞跃......,第二次飞跃,是适应科学种田和生产社会化的需要,发展适当的规模经营。”这表明邓小平主张 ( )
A.
．大力发展乡镇企业
B.
．确立市场经济体制
C.
．坚持家庭联产承包
D.
．深化农村体制改革
【单选题】A team of international researchers has found new evidence that an endangered subspecies of chimpanzee is the source of the virus that causes acquired immune deficiency syndrome (AIDS) in humans. Expe...
A.
people now know the number of chimpanzees is much smaller than expected
B.
it may make it possible for scientists to discover new ways of treating AIDS.
C.
it proves some deadly human diseases can also be transmitted to wild animals
D.
it will soon help the scientists develop a vaccine that prevents the AIDS virus
【单选题】Which of the' following statements is true?
A.
The researchers' work was unpopular because of its biased conclusions.
B.
The music industry was accused of unclear specification of the nature of the songs.
C.
The current CD labels failed to specify whether the music is appropriate for youth.
D.
The music industry would have to yield to the pressure from the politicians.
【简答题】In their study，researchers led by Pierre Maquet took advantage of the technique of__________．
【单选题】A team of international researchers has found new evidence that an endangered subspecies of chimpanzee is the source of the virus that causes acquired immune deficiency syndrome (AIDS) in humans. Expe...
A.
people now know the number of chimpanzees is much smaller than expected
B.
it may make it possible for scientists to discover new ways of treating AIDS.
C.
it proves some deadly human diseases can also be transmitted to wild animals
D.
it will soon help the scientists develop a vaccine that prevents the AIDS virus
【单选题】In the study， researchers succeeded in determining how coffee __________ different areas of the brain in 15 volunteers.
A.
motivated
B.
activated
C.
illuminated
D.
integrated
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