参考答案

正确答案：A
[答案]A。[解析] 题干分析：大意：大多数惯用左手的母亲把孩子抱在身体的左侧这个事实表明第一种解释是不正确的。利用题干中的核心词“first explanation”作为答案线索，这样发现答案相关句：Clearly there must be some other, less obvious explanation．该句暗示题干中提到的“first explanation”在前文中，这样发现了直接答案相关句：If asked to explain(与explanation呼应)the significance of this preference most people reply that it is obviously the result of the predominance of right-handedness in the population．By holding the babies in their left arms．the mothers keep their dominant arm free for manipulations．(该句揭示了第一种解释的内容)…It emerges that 83 percent of right-handed mothers hold the baby on the left side, but so do 78 percent of left-handed mothers．该句说明大多数用左手的母亲也是左手怀抱孩子，因此判断问题句的说法正确。