A.lack of certain nutrition.
B.powerty of their mother.
C.different family backgrounds.
D.reduction of oxygen levels.
45.It can be learned about form the paragraph that_____.
A.high-altitude babies tend to have high blood pressure in later life.
B.under-weight babies have a shorter life span.
C.babies born to poor families lack hormones before birth.
D.new born wealthy families have larger heads compared with their bodies.
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