A cosmologist differs from a cosmogonist in that ______.
A. he sounds a bit old-fashioned
B. he learns from Edgar Allen Poe
C. he studies the origin of the whole Universe
D. he tries to explain how the Solar System formed
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Adair points out that his theory can't be applied to aluminum bats because ______.
A. the "ping” sound is too vague for a fielder to catch
B. with the aluminum bats the batter always hits the ball stronger
C. they don' t produce different sounds of "crack" and "clunk"
D. the sounds they produce may interfere with the fielder's judgment
The biggest problem from now to the year 2010 for the ISS lies in that ______.
A. Soyuz capsules are not safe enough
B. the ISS will have a 4-year crewless gap
C. more money is needed to maintain the normal operation
D. the ISS partner nations can't reach agreement during this period
Why has the ISS now had only three crew members？
A. Because the Russian Soyuz capsules can't manage more.
Because the ISS has only enough room for three people.
C. Because three people are quite enough to run the ISS.
D. Because NASA commissions report to limit the number to three.
Which of the following statements best summarizes the main idea of this passage？
A. Hitting the ball to produce different sounds is not an easy matter.
B. The sound of the bat may give fielders more chances to catch the ball.
C. Aluminum bats are inferior to the wooden ones.
D. The study of Robert Adair shocks the Acoustical Society of America.
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