单项选择题

A．To demonstrate an experiment.
B．To explain the grading procedures.
C．To inform the students of the safety measures.
D．To tell the students how to use the safety equipment.
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单项选择题
A．They complete all their assignments.B．They study hard for his tests.C．They compete for the best seats in the class.D．They read all his books.
A．They complete all their assignments.
B．They study hard for his tests.
C．They compete for the best seats in the class.
D．They read all his books.
单项选择题
A．People continued to explore new lands.B．People started to make life better.C．People stopped making inventions.D．People started to explore more land.
A．People continued to explore new lands.
B．People started to make life better.
C．People stopped making inventions.
D．People started to explore more land.
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