托福考试

【单选题】
A、( It’s very expensive
B、It hasn’t proven to be totally effective
C、It can be damaging to some books
D、It can’t be used on books published before 1850

网考网参考答案：A
网考网解析：
[听力原文] What does the man say is a drawback to the process of restoring books document.getElementById("warp").style.display="none"; document.getElementById("content").style.display="block"; 查看试题解析出处>>