题目内容
8．听第9段材料，回答第13至15题．13．What can't the students do without a teacher？
A．Hold parties．
B．Complete the Safety Sheet
C．Use any emergency equipment
14．Why are the students asked to tie back their loose hour in the lab？
A．It may catch fire
B．It may cover their eyes
C．It may pass chemicals to their faces
15．What is the speech mainly about？
A．Laboratory regulations
B．Safety instructions
C．After-class activities．
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