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雅思每日一包。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：

Mutualism then is a kind of symbiosis, um, a specific type of symbiotic relationship where both organisms benefit somehow.

So your book is correct. Now, I want to make it clear that, um,
the positive result from being in a mutualistic relationship doesn’t have to be equal for both organisms.
It’s not a one-to-one ratio here, is everyone with me so far?
Symbiosis, general term; mutualism, a narrower or more specific kind of symbiosis.
Okay. Now, let’s take a close look at mutualistic relationships, um,
I’ll start off by describing a case of mutualism that involves a certain butterfly species found in South Africa and Australia.
It’s a good example of how dependence on a mutualistic relationship can vary.
OK, there’s this butterfly family and I’ll spare you the fancy Latin name because it is not important for our purposes here.
Uh, I’ll call them Coppers and Blues, well, because most members of this family have blue or copper colored wings.
I think this is one of the most interesting cases of mutualism,
these butterflies require the presence of ants to complete their life cycle, their interaction with ants is obligatory.
而互惠共生也是一种共生关系，一种具体类型的共生关系，在这种关系中两种生物在某种程度上都有所受益。
所以你看的书也没错。我要说清楚的是，
这种共生关系中产生的积极结果对两种生物来说不一定是平等的。
不是一比一的，大家目前都听懂了吗？
共生关系是一种广义的术语，而互惠共生是一个狭义的或者更具体的共生类型。
我们来仔细看看互利关系，
我从介绍一个互惠共生的案例开始吧，这个案例与在南非和澳大利亚发现的一种蝴蝶有关。
这在说明对互利关系的依赖程度有多么不同方面是个很好的例子。
有一个族群的蝴蝶，这个蝴蝶的拉丁语名字太花哨了，我就不说了，因为这对我们现在的目的不太重要。
我就叫它们蓝铜蝴蝶吧，因为大部分这种蝴蝶都有蓝色或铜色的翅膀。
我觉得这是互惠共生案例中最有趣的之一，
这些蝴蝶需要有蚂蚁的参与才能完成它们的生命周期，它们与蚂蚁的互动是强制性的。

2.阅读包答案：

政府究竞是以减少对技术的经费投入来增加对纯科学的投资，还是把二者反过来，这往往取决于把哪一方看作是驱动的力量。

3.写作包答案：

Clear Your Plate" Campaign proposes that diners eatup their food in plates and encourages them to takeleftovers home in order to avoid food wasting, so anumber of restaurants in China are offering smallerdishes now. The grain wasted in China each year isclose to 1/10 of the national total grain output, which has become the world's largest man-made disaster. "Clear Your Plate" Campaign reminds people that when they are wasting foodwithout restraint, there are still many people around the world who have died of starvation. It is no longer an action of a certain organization or an individual, but one related to thehuman living environment, which can contribute to resolving the current shortage ofresources.