【科学60秒】努力过后收获更甜_英语听力练习mp3下载-科学-沪江听力酷

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【科学60秒】努力过后收获更甜

听力简介：

Maybe your dad said, “The harder you work for something, the more you’ll appreciate it.” Well, father really did know best. Because a new study finds that the harder mice have to work for a treat, the better it tastes. The research appears in the Proceedings of the Royal Society.
Mice were trained to push levers to get either of two rewards. Press one lever, out comes a drop of sugar water. Press the other and they get a drop of different tasting sugar water.
Then things got interesting. For one of the treats, scientists gradually increased the amount of effort required for the payoff—from one lever-press to five, then 10, then 15. So by the end of the ____1____ , one type of sugar water cost 15 times more effort than the other.
The mice then retired to their home cage where both treats were ____2____. And they showed a strong preference for whichever reward they’d worked harder to obtain. Based on how fast the mice ____3____, they appeared to find the ____4____ sugar water more tasty.
Which makes evolutionary sense. An animal wouldn’t survive if a little hard work left ____5____ in its mouth.
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