单选题 According to this passage, if you could not understand a passage, you ______

A、 may not sit in the library
B、 probably don't know its background
C、 may not have practiced on reading it
D、 probably think it is too easy for you to read

【正确答案】 B

【答案解析】细节辨认题。根据第一段"The problem here is that the material they are practicing on is either too difficult for them in vocabulary or content, or not sufficiently interesting"可得出答案为B。