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【单选题】
牙本质中无机盐的含量约为重量的A.
70%
B.
50%
C.
90%
D.
96%
E.
69%
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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】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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