It has been recognized that the causes of premature births are multifarious, and it has been speculated that environmental______

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问题 It has been recognized that the causes of premature births are multifarious, and it has been speculated that environmental______, such as stress, fear, exile, and inadequate prenatal maternal care, contribute to the rate of premature births.

选项 A、elements
B、ingredients
C、factors
D、momentums

答案C

解析 句意:现在已经意识到早产的原因是多种多样的,而且据推测环境因素,例如压力,恐惧,流放,不充分的产前孕妇保健等是导致早产率上升的原因。element、ingredient、factor均有“组成成分”的意思:element指元素或某特定类型的人或群体,分子。ingredient指原料、成分。factor指(产生特定结果或状态的)因素,要素,侧重指原因。momentum意为“势头;动力”。结合语境,factor为最佳答案,因此选择C项。
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