问题补充:
At the top of the high mountains, there is very oxygen in the air.
A. a little
B. little
C. a few
D. few
答案:
A. a little
(答案→)B. little
C. a few
D. few
解析:句意:在高山顶上,空气中有少量的氧。few, a few是可数的, little, a little是不可数的。
few 和little表示很少,否定的意思。a few 和a little表示一些,肯定的意思。因为氧气是不可数名词,排除C、D;根据句意故选择B。