Which of the following statements is true according Paragraph three？A．College students hav
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Which of the following statements is true according Paragraph three？
A．College students have to pay more for textbooks than four years ago.
B．The NACS hardly encourages students to use used books or rent texts.
C．The annual tuition of college students has been declining slowly.
D．$655 for textbooks is a big sum compared to the annual tuition.
请帮忙给出正确答案和分析，谢谢！
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正确答案：D
第三段第二句说明课文的费用比四年前略低，相差近50美元。第三句讲这是由于美国大学商店协会鼓励学生使用旧课本。学生一年的学费是2900美元，而购买教材额外需要655美元，相比之下不是个小数字。本段最后一句使用现在进行时，强调作者的意图。成语adropinthebucket的含义是averysmallorunimportantamount(微不足道)。所以，这句话意味着655美元不是小数目。