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
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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.
Which of the following statement is NOT TRUE according to the passage？
A. If a baseball fielder cannot tell the distance a ball is going to travel by listening to the crack of the bat, they may lose the chance of catching it.
B. If a fielder relies purely upon sound information, the ball may have traveled too far for him to reach it in time.
C. The sound hit on the ball could mean a difference in running distance of as much as 30 meters.
D. If the ball do not hit on the sweet spot, the ball cannot travel as far as possible.
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