段3：①Growth, which rarely continues beyond the age of 20, demands calories and nutrients—notably, protein—to feed expanding tissues. ②At the start of the 20th century, under-nutrition and childhood infections got in the way. ③But as diet and health improved, children and adolescents have, on average, increased in height by about an inch and a half every 20 years, a pattern known as the secular trend in height. ④Yet according to the Centers for Disease Control and Prevention, average height—5′9″for men, 5′4″for women—hasn’t really changed since 1960.
32.Which of the following plays a key role in body growth according to the text?
[A]Genetic modification.
[B]Genetic modification.
[C]Living standards.
[D]Daily exercise.
答案：C
问：32题C选项Living standards对应原文中的哪些信息？（多选题）
A : calories
B : nutrients
C : improved diet
D : improved health
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