Polar bears live mostly on ________ sea ice, which they use as _______ platform for hunting seals.
A. a; a B. a; the C. 不填; a D. the; 不填
Polar bears live mostly on ________ sea ice, which they use as _______ platform for hunting seals.
A. a; a B. a; the C. 不填; a D. the; 不填
C
解析： ice 是不可数名词，在这里是泛指。不可数名词即使前面有半泛指性定语也不加the. 如：Chinese history; platform 是可数名词, 用a表示泛指