单选题What is the purpose of the author in writing this passage?ATo stop people from drinking milk.BTo refute the theory that milk is good for health.CTo introduce us a new discovery on genetic mutation.DTo infer the declination of the cattle industry.
单选题
What is the purpose of the author in writing this passage?
A
To stop people from drinking milk.
B
To refute the theory that milk is good for health.
C
To introduce us a new discovery on genetic mutation.
D
To infer the declination of the cattle industry.
参考解析
解析：
文章开头指出人在成年后还能喝牛奶是很奇妙的。接着解释为什么这一现象是不正常的。进而说明是因为基因突变导致。综上所述，选C项。
文章开头指出人在成年后还能喝牛奶是很奇妙的。接着解释为什么这一现象是不正常的。进而说明是因为基因突变导致。综上所述，选C项。
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