Why are boys more at risk especially the overweight boys？A．Boys like vigorous sports so
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Why are boys more at risk, especially the overweight boys？
A．Boys like vigorous sports, so their heart bear more burden.
B．Boys don"t like go to hospital to receive ultrasound treatment.
C．Their hearts are usually too big to pump blood very well.
D．Their hearts are over worked to support their bodies if they are overweight.
请帮忙给出正确答案和分析，谢谢！
更新中~-
正确答案：D
文章第四段提到，身体超重的男孩子，他们的心脏要费很大力气使血液穿过那些多余的脂肪层，这就会导致心脏壁越来越厚。这与选项[D]所述内容相同，所以，答案为[D]。心脏在过度使用后才会变得越来越大，以致不能正常供血，所以[C]选项是结果，而不是原因。