What does the author intend to illustrate with the example of the Harts？A．The difficulty o

A
解析：本题问“作者举Harts家的例子说明了什么”。第一段中提到“Hermother，…knows all too wellthe daunting calculus of paying for a college education．Last year the average yearly tuition at a private．four-year school climbed 5．5 percent to more than $17, 000…Even a number cruncher likeTally admits it’s a little，scary，…”意思是大学教育费用是一个令人心跳畏缩的数字，去年私立四年制大学的年平均学费增长了5．5％，超过17，000美元，这真有点让人恐慌。由此可见，这个例子说明了学费很贵，“支付学费的难度”，故选A。