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二、选择填空。（每题1分，计15分）
（ ）21.The number of the wild animals ___ becoming ______ now.
A. are, more and more small B. are, bigger and bigger
C. is, more and more big D. is, smaller and smaller
（ ）22.Is Zhalong one of the world\'s ________?
A. importantest wetland B. the most important wetlands
C. more important wetlands D. most important wetlands
（ ）21.The number of the wild animals ___ becoming ______ now.
A. are, more and more small B. are, bigger and bigger
C. is, more and more big D. is, smaller and smaller
（ ）22.Is Zhalong one of the world\'s ________?
A. importantest wetland B. the most important wetlands
C. more important wetlands D. most important wetlands
