第71期：In the Womb: Multiples

Are identical twins really identical? Not really. The National Geographic Channel’s In the Womb: Multiples investigates.

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参与方式：

1、给听写挑错。没有听出来的和不确定的地方我都会红色标注，当然没有标出来的地方也会有错，请大家仔细的听哦。挑错成功有奖：）请大家把答案设置成楼主可见，防止出现抄袭现象。
2、听写材料中空缺的单词（100HY）[可能是单个或多个单词, 也可能是句子]，参考答案回复可见。

PS:这次的NG由于实在是过于简单，采用句子听写，并且鼓励全文听写。--- Soli

Identicals share one of the closest human relationships biologically. They are likely to grow up looking and sounding extremely similar, yet not a 100% match.____1____. These genes can mutate after the egg has split, subtly modifying the way each embryo grows. Small differences in height, build and even personality will become more and more apparent as the twins grow up and reach maturity.___2___. Identical twins are almost always the same sex, but surprisingly, there are a tiny number of boy-girl monozygotic twins.____3____. Occasionally, an egg contains three sex chromosomes: two Xs and a Y. But if the egg divides to produce monozygotic twins, a chromosome may be lost in the process, leaving one embryo with the girl’s XX combination, and her monozygotic twin as an XY boy.

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