问题补充:
As we all know, the number of Tibetan antelopes(藏羚羊) becoming .
A. is; less and less
B. are; less and less
C. is; smaller and smaller
D. are; smaller and smaller
答案:
A. is; less and less
B. are; less and less
(答案→)C. is; smaller and smaller
D. are; smaller and smaller
解析:句意:我们都知道,藏羚羊的数量越来越少。数量the number of的be动词用is;数量的少用small。所以选C。