题目

 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 答案：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

查看本题答案和解析