What's the meaning?
做听力中遇到这样的一个对话：M: Scientists claim the world population has 99.5% of the same DNA.
W: But this doesn't tell us there is no such thing as race.
Q: What is true of the DNA of different races?
Choices——
A) They are the same.
B) They are almost the same.
C) They are quite different.
D) They are entirely different.
答案选B)
理解上很迷惑，对话命题中，M所说的DNA怎么会相似呢（常识好像说不通）？W的那句话又到底是什么意思呢？实在弄不懂
劳烦大家看看，多谢！ M: Scientists claim the world population has 99.5% of the same DNA.
科学家说世界人口中有99.5%相同的dna（也就是0.5%的dna差异，导致了人类的遗传表达的差异，不同人的dna可能只有细微的差异，据说人和猴子dna的相似度也十分高呢）
W: But this doesn't tell us there is no such thing as race.
但是这并不意味着种族（这个东西）不存在
Q: What is true of the DNA of different races?
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