单项选择题

Questions 19 to 22 are based on the conversation you have just heard.

A．They are often handled improperly by readers.
B．The paper is destroyed by chemicals.
C．The ink used in printing damages the paper.
D．The glue used in the binding loses its strength.
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单项选择题
A．It is not as difficult as she had thought it would be.B．She would like her professor to explain it more clearly.C．She took a class on it last semester.D．Her professor will write a book on it soon.
A．It is not as difficult as she had thought it would be.
B．She would like her professor to explain it more clearly.
C．She took a class on it last semester.
D．Her professor will write a book on it soon.
单项选择题
A
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