Paragraph Six A report concluded that normal children aged between 9 and 17 exhibit ahigher level of anxiety today than children who were treated for mental illness 60yearsago.The report cited two main reasons: increasing physicalisolation-brought on by high divorce rates and less involvement incommunity-and a growing perception that the world is a more dangerous place. 41. The c__________of a higher level ofanxiety today.
【正确答案】：causes
【题目解析】：本段介绍了一份研究报告的发现。根据该报告，如今9岁-17岁的正常青少年比60年前接受精神基本治疗的孩子还要焦虑。报告引用了两个主要原因：高离婚率和低社区参与程度带来的与他人的隔离以及认为世界更危险这种越来越普遍的观点。本段重点就是分析当前人们焦虑的原因。以字母c开头表示“原因”的词只有cause一词的复数causes。
