单项选择题

Passage 3
Questions 32 to 35 are based on the passage you have just heard.

A) Progress in medicine. C) Progress in computers.
B) Progress in new materials. D) Progress in helicopters.
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填空题
M。
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.
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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