A、[A] Genetic modification.
B、[B] Natural environment.
C、[C] Living standards.
D、[D] Daily exercise.
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试题解析
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;