Which of the following plays a key role in body growth according to the text？[A] Geneti
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Which of the following plays a key role in body growth according to the text？
[A] Genetic modification.
[B] Natural environment.
[C] Living standards.
[D] Daily exercise.
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正确答案：C
从第三段“but as diet and health improved, children and adolescents have increased in height by…..”可以看出生活水平对于身体成长起着非常重要的作用；另外，A，B，D选项所涉及的genetic modification ,natural environment 和daily exercise文中并没有提到；