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[听力资料] 老托福minilecture 听力+文本+题目+答案 [复制链接]

  • TA的每日心情
    白富美
    2016-9-18 12:54:51
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    发表于 2016-5-17 21:49:36 |显示全部楼层
    本帖最后由 下课闹闹&~ 于 2016-5-17 22:41 编辑

    时间为3分钟,每个讲座有6个题目。这个材料适合大家在基础不好的时候做听写,或者精听使用。讲座的逻辑和范围和真实考试一致。如果你是在15分左右,需要提高听力的精准度,需要提高词汇的储备,这个材料非常好。很多基础不好的同学,都是听力这个材料,再加上结构听力法,可以考到20分以上。基础稍好的,能有25分以上!
    P: Yesterday, we were talking about seed dispersal, which is necessary to the survival of the plant species. So, what are some ways that seeds get spread around? Yes.
      M: Some seeds are in fruits that attract birds and other animals. And when the animals eat the fruit, the seeds don’t get digested because they have a hard covering. So they pass right through the animals’ digestive system and get deposited back into the soil.
      W: But some fruits are poisonous which will discourage animals from eating the seeds right?
      P: Well, even though many fruits are poisonous to humans and other animals, most can be eaten by some variety of bird. For example, the berries of a family of plants called nightshade can be deadly to humans. But some birds eat these berries as a regular part of their diet.
      W: Still it seems to me that if a seed is inside a fruit that is not poisonous to see if it has a better chance of getting spread and so plants will tend to evolve without poisoning their fruits.
      P: Well, some poisons are actually quite helpful to fruits. For example, the poison in nightshade berries is a type of chemical called glycoalkaloid. Researchers have found that the glycoalkaloid in nightshade berries inhibits the growth of fungi. So it keeps the fruit from rotting. They’ve also found that the glycoalkaloids give nightshade berries a strong bitter of flavor, making them distasteful to some animals that might otherwise eat them. Still, some birds do eat them.
    W: So the berries have enough poison to prevent rotting but not so much that all animals avoid them.
      P: Right, a kind of evolutionary compromise. But other fruits have evolved differently. For example, tomatoes contain high levels of glycoalkaloids while they are still green. But as the seeds develop and the tomato ripens, the level of glycoalkaloid goes down.
      M: So the glycoalkaloids discourage animals from eating tomatoes before the seeds are mature?
      P: Yes. In fact, people even find the level of glycoalkaloids in ripe tomatoes somewhat distasteful. So they’ve been bred to remove traces of bitterness, and that’s one reason why the tomatoes at the grocery store go bad so quickly. They’ve been stripped of their anti-fungal defenses. Researchers are trying to find chemicals in fruits that prevent rotting without spoiling taste. Then we wouldn’t have to refrigerate fruits or spray them with wax.
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    发表于 2016-6-2 10:25:14 |显示全部楼层
    多谢!!

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    发表于 2016-6-27 20:34:47 |显示全部楼层
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    发表于 2017-2-5 10:52:59 |显示全部楼层
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    着急
    2013-3-16 18:55:47
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    发表于 2017-4-20 10:39:28 |显示全部楼层
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    发表于 2017-4-21 03:03:10 |显示全部楼层
    thanks for sharing

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    发表于 2017-5-12 13:10:36 |显示全部楼层
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    奋斗
    2015-8-18 14:55:31
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    发表于 2017-8-16 10:42:54 |显示全部楼层
    谢谢分享

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    发表于 2017-8-17 16:43:30 |显示全部楼层
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    发表于 2018-3-9 08:20:16 |显示全部楼层
    感谢感谢感谢感谢感谢感谢

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    发表于 2018-4-5 12:51:54 |显示全部楼层
    托福
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    2016-1-26 21:40:42
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    发表于 2018-4-22 23:02:17 |显示全部楼层
    many thanks

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    发表于 2018-4-23 22:32:14 |显示全部楼层
    DDDDDDDDDDDDDDDDDD

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    2018-4-26 08:44:52
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    发表于 2018-4-25 10:56:49 |显示全部楼层
    哇!!!!!!!!!

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    发表于 2018-9-3 14:37:10 |显示全部楼层
    好东西大家一起分享

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    发表于 2018-9-5 20:19:22 |显示全部楼层
    sdfadadadasa

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    发表于 2019-6-18 16:02:48 |显示全部楼层
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