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2016英语专业四级听力短文听写模拟练习（14）

2016-04-22 14:00:09来源：网络

2016英语专业四级听力短文听写模拟练习（14）

　　How High Can You Jump?

　　Flea trainers have observed a strange habit of fleas while trainingthem.

　　Fleas are trained by putting them in a cardboard box with a topon it. The fleas will jump up and hit the top of the cardboardbox over and over and over again. As you watch them jumpand hit the lid, something very interesting becomes obvious.The fleas continue to jump, but they are no longer jumping highenough to hit the top.

　　When you take off the lid, the fleas continue to jump, but they will not jump out of the box. Theywill not jump out because they cannot jump out. Why? The reason is simple. They haveconditioned themselves to jump just so high. Once they have conditioned themselves to jumpjust 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 that they are doing all they can do.

　　Useful Words and Expressions:

　　1. cardboard 纸板

　　2. lid 盖子

　　3. conditioned 有条件的，习惯于……的

　　4. restrict 限制，约束

　　be restricted within narrow limits 限于狭窄的范围内

　　be restricted in one’s movements 行动受限制

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