A-A+
A．They are marked with colored labels.B．They a
问题详情
A．They are marked with colored labels.
B．They are specially ceded.
C．They are checked out.
D．They are inspected by tile guard.
参考答案
正确答案：B
解析：事实题。从倒数第二句“It seems that all the books in the library are all specially coded”得知，图书馆的所有书都上了密码。答案应为B。
