The results of the study indicate the reason for
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The results of the study indicate the reason for the birth of underweight babies is＿______.
A. lack of certain nutrition
B. poverty of their mothers
C. different family backgrounds
D. reduction of oxygen levels
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答案：D
由第五段“The results suggest that babies born at high altitude are deprived of oxygen before birth.”可知，研究结果表明，在高海拔地带出生的婴儿出生前就缺氧，这也是造成其出生体重低的原因，故选D。