S6. The most popular music styles enjoyed by the Americans are usually ______.
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The author uses the example of the question of life in other galaxies primarily in order to
A. (A) question whether in certain situations the truth may ever be determined
B. (B) illustrate that truth has an objective existence even when there are few empirical grounds for determining it
C. (C) suggest that the answer to certain scientific questions plays only a minor role in people’s lives
D. (D) support the thesis that skepticism plays a vital role in the scientific process
E. (E) assess the answers pseudo-sciences like ufology provide for unanswerable questions
According to the passage, which of the following statements best describes the relationship between secondary atmospheric circulations and jet streams
A. (A) Jet streams and baroclinic waves tend to interact most intensely with one another in the winter, then act independently in the summer.
B. (B) Jet streams and baroclinic waves tend to exist at various points in the atmosphere in inversely proportional strength.
C. (C) Jet streams and baroclinic waves may behave differently, but they issue from a common source and augment one another.
D. (D) Jet streams tend to distribute kinetic energy in the atmosphere, and baroclinic waves relay this energy back to the jet stream.
E. (E) Jet streams tend to be more affected by the presence of landmasses than do haroclinic waves.
According to the passage, in the Cepheid variable method all of the following have a significant role in the calculation of the distance of a galaxy EXCEPT
A. (A) The intrinsic luminosity of a Cepheid
B. (B) The comparative luminosity of ordinary stars
C. (C) The observed brightness of the Cepheid
D. (D) The data suggesting the expansion of the universe
E. (E) The correction of the period-luminosity relation for the star being observed
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