问题补充：
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
答案：
A. The number, larger and larger
B. A number, larger and larger
(答案→)C. The number, smaller and smaller
D. A number, smaller and smaller
解析：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
