The results of the study indicate the reason for
已帮助 人
The results of the study indicate the reason for the underweight babies is______.
A. lack of certain nutrition
B. power of their mother
C. different family backgrounds
D. reduction of oxygen levels
-
答案：D
根据第五段“The results suggest that babies born at high altitude are deprived of oxygen before birth.”可知，那些体重不足的婴儿在出生前就缺氧了。因此D项正确。