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Passage 1

admin2018-01-04  37
问题 Passage 1
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.
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答案 世界上约有70亿人。每个人都与众不同。每一个生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。
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