19. A) The lifecycle of trees. B) The number of trees.
C) The intensity of solar burning. D) The quality of air.
20. A) It affects the growth of trees.
B) It has been increasing since the Ice Age.
C) It is determined by the chemicals in the air.
D) It follows a certain cycle.
答案:
1.D 2.A 3.A 4.C 5.Br6.C 7.A 8.D 9.C 10.Cr11.C 12.A 13.C 14.B 15.Br16.C 17.A 18.D 19.C 20.D
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