高中英语语法题，请解释

1、There are usually at least two ___ of looking at every question.
A means B directions C views D ways
答案：D 。我选了C。请解释它们有什么区别，并翻译。

2、___ it is to listen to the classical music!It's much softer than pop.
A How fun B How a fun C What fun D What a fun
答案：C。我选了A。因为fun是不可数的。那么what a ……和how ……something is 怎么区别呢？

3、The rising ___ did a lot of ___ to the crops.
A water;harm B water;harms C waters;harm D waters;harms
答案：C。请解释。

4、The album of paintings in this museum is a ___ from an old professor.
A gift B present C talent D genius
答案：A。 请解释前两项有什么区别，分别在什么情况下用。

5、The children in this school enjoy a happy ___ ,which benefits them much in the development.
A environment B atmosphere C surroundings D air
答案：B。我选了C。请问B和C 都表示“环境”，它们各自偏重哪个方面？

6、——Were you paid last week?
——Yes.But I can't remember the exact ___ of the money.
A number B amount C value D percent