The second paragraph focuses on the fact that ______.
A. fossil energy was once very cheap
B. farm in dry areas could get cheap water
C. most American farmers used too much fertilizer and pesticide
D. mainstream American agriculture used to be wasteful of energy, water and land
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听力原文：We enjoyed a concert last night and we found the pianist was undisturbed by the impolite whispering in the audience.
(25)
A. The pianist was whispering to the audience impolitely while playing.
B. The noise didn't bother the pianist.
C. The pianist disturbed people with his impolite playing.
D. The performance was impolite to some audience.
(28)
A. The two girls are having too much to the neck.
B. The two girls are actually twins.
C. The two girls are ranking with each other in studies.
D. The two girls are promised to have a necklace for their studies.
From the passage we can infer that real happiness of life belongs to those ______.
A. who are at the bottom of the society
B. who axe higher up in their social status
C. who prove better that their fellow-competitors
D. who could keep far away from this competitive world
There is a hot debate in America about ______.
A. whether those who are under 18 need cosmetic surgery
B. whether people should have "maintenance" work in their thirties
C. at what age people should have cosmetic surgery
D. whether cosmetic surgery should cater for the average person
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