听第9段材料，回答第13至15题．
13．What is the speaker mainly talking about？
A．Course materials．
B．After-school activities．
C．Changes in the timetable．
14．What will the first class be today？
A．English．
B．History．
C．Art．
15．Which group will meet on Friday？
A．The debating group．
B．The handball group．
C．The music group．

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