【答案解析】世界上约有70亿人。每个人都与众不同。每一个牛物都是特性独特组合的产物。为什么每个生物都会与众不同?
150多年前，一个名叫门德尔的科学家研究了植物，尤其是豌豆植株。他很想知道为什么每一株豌豆会有它特定的颜色、形状和尺寸呢?
门德尔发现豌豆植株携带某种因子，父母辈/上一代植株将这些遗传因子传给子代/下一代植株。今天我们将这种遗传因子称为基因。
基因是一种将遗传信息从父母一代传给子代/下一代的微小物质。现在我们知道每个人都是一个与众不同的独特体，主要原因在于每个人都是基因独特组合的产物。 [听力原文]
There are about 7 billion people in the world. But every person is unique. Every living thing is a unique combination of characteristics. Why is each living thing unique?
Over 150 years ago, a scientist by the name of Mendel studied plants, especially pea plants. He wondered why each pea plant was of a certain color, shape and size.
Mendel discovered that pea plants carried factors, and parents passed these factors onto their offspring. Today we call these factors genes.
Genes are tiny pieces of matter that carry information from parents to offspring. Now we know that every person is unique. A major reason is that every person is a unique combination of genes.

【答案解析】欢迎大家出席此次各国首脑峰会。我要感谢世界各国领导人的到来。我们来到这里，因为建立一个更加繁荣和稳定的世界是各国使命的重中之重。
我们来到这里，因为十年前国际社会承诺将不遗余力地使全人类免于匮乏/贫穷。现在，我们取得了许多切实的成果。
我们比以往任何时候拥有更多的成功发展的故事/事例，如：入学人数大幅增加，更多的人能享用清洁水。疾病得到更好的控制等等。
但是，我们必须保护这些成果/成就。让我们为世上所有人拥有更加美好的未来作出更大的努力。因为我们都知道，没有一个全球性项目比我们现在正在从事的这个项目更有价值/我们现在正在从事的是最有价值的全球性项目。 [听力原文]
Welcome to the Summit of State Leaders. I thank the world"s leaders for being here. We are here because building a more prosperous and stable world is at the heart of the mission of all the countries.
We are here because ten years ago, the international community promised to spare no effort to free the entire human race from poverty. And now, we have quite a lot of real results.
We have more development success stories than ever before, such as dramatic increases in school enrollment, expanded access to clean water and better control of disease.
But we must protect these achievements. Let us make more commitment to a better future for all human kind. As we all know, there is no global project more worthwhile than the one we are now engaged in.