[单项选择]According to the passage, scientists have positively confirmed that the brains of narcoleptics differ from those of normal brains in which of the following ways


A. Narcoleptic brains tend to remove degenerative tissue at a more prolific rate than that of nonnarcoleptics.
B. Narcoleptics are less responsive to drugs which treat neural autoimmune dysfunction than are nonnarcoleptics.
C. Nonnarcoleptics do not possess the same neurological immune antigens as narcoleptics.
D. Neurons that control muscle tone are damaged in the brains of narcoleptics, but not in those of non-narcoleptics.
E. (E) Narcoleptics experience greater neural degeneration as a result of aging than do nonnarcoleptics.

[单项选择]According to the passage, scientists have positively confirmed that the brains of narcoleptics differ from those of normal brains in which of the following ways


A. Narcoleptic brains tend to remove degenerative tissue at a more prolific rate than that of nonnarcoleptics.
B. Narcoleptics are less responsive to drugs which treat neural autoimmune dysfunction than are nonnarcoleptics.
C. Nonnarcoleptics do not possess the same neurological immune antigens as narcoleptics.
D. Neurons that control muscle tone are damaged in the brains of narcoleptics, but not in those of non-narcoleptics.
E. (E) Narcoleptics experience greater neural degeneration as a result of aging than do nonnarcoleptics.

[单项选择]According to the passage, scientists have decided that sulfur aerosols from volcanic eruptions affect global temperatures to a greater extent than ash clouds because


A. the greenhouse gas effect produced by human activities tends to have a much greater environmental effect than that of volcanic explosions
B. clouds of sulfur-rich gases tend to achieve greater heights in the stratosphere than do ash clouds
C. a particular explosion producing high sulfur and little ash had a greater environmental effect than the converse
D. the burning of fossil fuels tends to exacerbate the effects of sulfurous aerosols, but not those of ash clouds
E. (E) global warming effects tend to minimize the impact of ash clouds, but not those of sulfurous aerosols

[单项选择]According to passage, scientists failed to______.


A. discover the characteristic of nuclear process
B. discover the nature of uranium ore
C. save the life of uranium miners
D. store nuclear wastes in underwater tanks

[单项选择]According to the passage parents have become increasingly interested in______.

[单项选择]According to the passage, scientists are skeptical toward their equations because scientists ______.


A. work to explain real, rather than theoretical or simplified situations
B. know that well-defined problems are often the most difficult to solve
C. are unable to express their data in terms of multiple variables
D. are unwilling to relax the axioms they have developed

[单项选择]According to the passage, why some scientists are thinking twice about doing or reporting their research


A. Because they are lack of fund.
B. Because they have to share the honor with others.
C. Because their research may arouse Controversy.
D. Because the government bans them from publishing the results of their research.

[单项选择]According to the passage sport is positive for young people in that ______.


A. it can help them learn more about society
B. it teaches them how to set realistic goals for themselves
C. it enables them to find flaws in themselves
D. it can provide them with valuable experiences

[单项选择]According to the passage you have just heard, which of the following is the most important


A. The time factor.
B. Musical language.
C. Character.
D. Consciousness.

[单项选择]According to the passage, positive ions can be produced by ______.


A. computer display screens
B. thunderstorms
C. earthquakes
D. typhoon

[单项选择]According to passage, Indian names were important because they ______.
A. described the character of a man
B. described the appearance of a man
C. were never used by other people
D. told us his profession