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________ of giant pandas is getting _________ because their

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________ of giant pandas is getting _________ because their living areas are becoming farmland.
A.The number, larger and larger
B.A number, larger and larger
C.The number, smaller and smaller
D.A number, smaller and smaller
C

the number of 表示···数量,做主语时,相当于单数形式,a number of,表示大量的,作主语时,相当于复数形式。故选C