Question

The Yangtze River carries ________ water from west to east．

1. A.
   a few
2. B.
   a lot
3. C.
   a number of
4. D.
   an amount of

Answer 1

D
water为不可数名词，前面用an amount of．而a number of和a few都跟可数名词．a lot of既可跟可数名词，又可跟不可数名词．