单项选择题

A．To return some business books.
B．To apply for a new library card.
C．To check out some books from the library.
D．To find out where the art books are located.
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单项选择题
A．He left his notes at home.B．He doesn’t know where his notes are.C．He doesn’t want to lend his notes to the woman.D．He agrees to lend her his notes.
A．He left his notes at home.
B．He doesn’t know where his notes are.
C．He doesn’t want to lend his notes to the woman.
D．He agrees to lend her his notes.
填空题
The reason is still ______ why certain individuals have bad reactions to a drug or to a particular dose of a drug, while others don’t.
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