每周一听——那些年我们一起练过的听力（第183期）

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每周一听——那些年我们一起练过的听力（第183期）

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Chimpanzees spend about half their day    (1)    . "And for context, think about how much time a day you spend chewing." Daniel Lieberman, a professor of human evolutionary biology at Harvard University. "So how did we make that    (2)    , from spending most of our day or half of our day chewing, to spending less than five percent?"

Cooking certainly tenderizes food, making it easier to chew and    (3)    . But evidence for human cookfires goes back only about 500,000 years, if that. And Homo erectus had already    (4)    weaker jaws, and smaller teeth, more than a million years before that. So Lieberman and his colleague Katherine Zink began their    (5)    by recreating a paleolithic dinner: yams, carrots, beets… and goat meat. "If you were to try to eat some raw goat with your teeth you would find that you would chew and chew and chew, it's like bubblegum."

Lucky    (6)    got to experience that, by chewing the food. Either in its wild, un-tenderized state, or after it was bashed or sliced with Flintstonian tools. As the study subjects ate, the researchers    (7)    the frequency and force of each chew. And they found that a diet of abundant, pre-sliced meat, with a side of pounded root vegetables, might have saved Homo erectus two and a half million chews a year. Meaning: less need for big, bulky jaws and teeth. The research is in the journal Nature.

Of course, these days "processed food" has a pretty bad rap. But for our    (8)    , food processing was key. "It's hard for people today to    (9)    what it was like to cook and eat and hunt during those times. For the vast majority of our    (10)    history, our ancestors had to work pretty hard to chew their dinner." Something for you to chew on, perhaps over dinner tonight.
小伙伴们，上周又有许多新伙伴加入我们，是不是我们的活动吸引了他们呢？我将一如既往地和大家一起进步，每天进步一点点。觉得上期分享的句子很励志，继续分享给大家。“Every Saturday, you will have a choice: You can either watch TV, or you can study. If you study, it turns out that there will be almost no short term reward. The following Monday, you won't be that much better at your job, and your boss almost certainly won't know you spent all day studying nor tell you "good job." So, you have almost nothing to show for your day of hard work.But here's the secret: If you study hard not just for one weekend, but do so weekend after weekend… for a year… then you will become great at it. I think studying has almost no short term rewards. But the long term rewards are huge! Andrew Ng”
奖励活动继续，连续参加4期的小伙伴们请私信我，期待你们得到更多的奖励！
上期答案
1. explanations
2. reveal
3. challenges
4. dimensions
5. awareness
6. thoughts
7. mentality
8. worthwhile
9. realistic
10. reflections

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• 183.mp3

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