宝春

各位同学们，为了督促帮助大家持续提升英语能力，培君老师们特意给大家准备了托福每日一包。每天覆盖听说读写内容，坚持完成两周以上，就能见到自己的英语能力不断上涨哟。

1.听写包 答案：

listen to part of a lecture in a botany class.

It’s autumn and as you know in most parts of the United States, the leaves on the trees are changing color from green to yellow, orange and lots of other colors.
So this will be a great time to talk about how and why some of these leaves turn one color in particular and that’s bright red.
Well, before we discuss why leaves turn red,
first, let’s, um, look, I know this is very old material, but just to play it safe, let’s first go over why leaves are usually green.
It’s chlorophyll, right? Leaves get their green color from chlorophyll, the chemical that’s responsible for photosynthesis.
The chlorophyll in the leaves collects energy from the Sun in the form of sunlight and it converts this energy into sugar which is food for the plants.
It’s chlorophyll that makes leaves green most of the time.
Now, the classic explanation for why leaves change color is this: in autumn, the leaves start preparing for the winter and stop synthesizing new chlorophyll.
Since chlorophyll is sensitive to sunlight and to cold temperatures, both of which you get in autumn, the existing chlorophyll in the leaves breaks down.
And since it’s not been replaced by the new chlorophyll, the green color of the leaves gradually fades away.
As this happens, the other pigments present in the leaf become visible.
请听植物学课上的部分内容。
现在是秋天，正如你们所知，在美国的大部分地区，树上的树叶正从绿色变成黄色、橘色和很多其他颜色。
所以现在是个绝佳的时机来谈论一些树叶是如何以及为什么会变成一种特别的颜色，那就是亮红色。
在我们讨论树叶为什么会变红之前，
我们首先......我知道这是非常老的材料，但是为了保险起见，我们先来过一遍树叶为什么通常是绿色的。
是叶绿素对吧？树叶从叶绿素中获得它们的绿色，这种化学物质是产生光合作用的原因。
树叶中的叶绿素从太阳的阳光中收集能量，然后将这种能量转化成植物的食物——糖。
让树叶在大部分时候保持绿色的正是叶绿素。
对树叶为什么会变颜色的传统解释是：在秋天，树叶开始为冬天做准备，停止合成新的叶绿素。
因为叶绿素对阳光和低温很敏感，而在秋天这两个因素都有，所以树叶中存在的叶绿素开始分解。
由于没有新的叶绿素来代替它，树叶的绿色渐渐消退。
这种现象发生时，树叶中的其他色彩开始显现。

2.阅读包答案：

他们或许教得很好，而且不仅仅是为了挣薪水，但他们大多数人却很少或没有对涉及道德判断的人类问题进行独立思考。

3.写作包答案：

Acrobatics is the performance that shows excellent skills of balance and action coordination. Acrobatics is most often associated with activities that make extensiye use of gymnastic skills, such as circus and gymnastics, but many other activities，such as wushu,ballet and diving may also adopt elements of acrobatics.Wuqiao is well known as the hometown of acrobatics in China. It is said that all residents in Wuqiao, from kids learning to walk to the old with grey some acrobatics. Young people practice the art during the breaks from work.Many families have their unique skills handed down through generations. There are acrobats from Wuqiao Aroughout China, even the world.As a Chinese acrobatics field, if you don't have an acrobat from Wuqiao, you can't have an acrobatics troupe.