333.We always keep　_______　spare paper,in case we ran out.

A.too much

B.a number of

C.plenty of

D.a good many

334.Green products are becoming more and more popular because they are environmentally _____.

A.friendly

B.various

C.common

D.changeable

333.答案是C；

too much太多的…，修饰不可数名词或单独使用；a number of/a good many许多，大量，修饰可数名词；plenty of 丰富的，大量的，修饰可数与不可数名词。

334.答案是A;

此题考查固定表达:be environmentally friendly 环保的。