英语专业四级听写040

Passage 40
How High Can You Jump?
Flea¹ trainers have observed a strange habit of fleas² while training them.
Fleas are trained by putting them in a cardboard³ box with a top on it. The fleas will jump up and hit the top of the cardboard box over and over and over again. As you watch them jump and hit the lid, something very interesting becomes obvious. The fleas continue to jump, but they are no longer jumping high enough to hit the top.
When you take off the lid, the fleas continue to jump, but they will not jump out of the box. They will not jump out because they cannot jump out. Why? The reason is simple. They have conditioned themselves to jump just so high. Once they have conditioned themselves to jump just so high, that is all they can do.
Many times, people do the same thing. They restrict themselves and never reach their potential. Just like the fleas, they fail to jump higher, thinking they are doing all they can do.

1 flea   

n.跳蚤

参考例句：

• I'll put a flea in his ear if he bothers me once more.如果他再来打扰的话，我就要对他不客气了。
• Hunter has an interest in prowling around a flea market.亨特对逛跳蚤市场很感兴趣。

2 fleas   

n.跳蚤( flea的名词复数 )；爱财如命；没好气地（拒绝某人的要求）

参考例句：

• The dog has fleas. 这条狗有跳蚤。
• Nothing must be done hastily but killing of fleas. 除非要捉跳蚤，做事不可匆忙。 来自《简明英汉词典》

3 cardboard   

n.硬纸板，卡纸板

参考例句：

• She brought the shopping home in a cardboard box.她将买的东西放在纸箱里带回家。
• There is a sheet of stiff cardboard in the drawer.在那个抽屉里有块硬纸板。