power,strength,energy和force都含有“力、力量”的意思，但所指范围不同：

power: 基本意思是“力，力量”，指人或国家甚至是某个机构的权力、势力或影响力。

strength: 说人时，指“体力，力气”；说物时，指“强度”。也可指“强项，长处”。

force: 主要指强制力量，暴力，武力等。

energy: 主要指人的精力。

练习：用force，power，energy，strength填空

1. Not that I don’t want to help you，but that it’s beyond my _______to do so.

2. She has always been encouraged to swim to build up the __________of her muscles.

3. If you do not open the door，I am authorized to enter by use of _______.

4. Young people usually have more  _______than the old.

答案：1. power  2. strength   3. force   4.energy

D 5. --- You are always full of _____. Can you tell me the secret?

--- Taking plenty of exercise every day.

     A. power      B. strength      C. force  D. energy   07福建