【问】 Two waterfalls within the city limits supply Rochester，New York，with an enormous number of electric power. (TOEFL，82.11)

我没有看出句中的错误。请分析。

【答】 虽然an enormous number of与an enormous amount都表示“大量的”，但是前者只能与可数名词连用，而后者只能与不可数名词连用。electric power为不可数名词，所以，必须与anenormous amount连用。the number of与the amount of的区别亦是如此。

1. There were a large number of people there. (Palmer)

那里有很多人。

2. The number of competitors is limited. (Cameron)

竞争者的数目有限。

3. I had not expected such an amount of praise. (Davies)

我没有料到会得到如此之多的赞扬。

4. The amount of lift increases with the speed of the aircraft. (SS)

飞机的升力随着飞行速度的提高而增大。

请做下面的英语试题：

1. The reason for the great of smoke is that there too factories in the city.(攻读硕士学位研究生入学考试英语试题，80A)

2. The of species every year natural habitats disappear.(TOEFL，80. 3)