单项选择题

Section B
Passage One
Questions 26 to 28 are based on the passage you have just heard.

A.Too slow for a difficult book though just right for a non-serious one.
B.Too slow for a non-serious book but too hast for a difficult one.
C.Too fast for difficult material though just right for a non-serious book.
D.Too fast for a non-serious book as well as a difficult one.