单项选择题

What is the purpose of the talk

A．To review what students know about volcanic activity.
B．To demonstrate the use of a new measurement device.
C．To explain the answer to an examination question.
D．To provide background for the next reading assignment.
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单项选择题
What did the professor want to talk to Ann about
A．A vacation trip to Yellowstone Park.
B．A lecture by a visiting professor.
C．Her biology thesis.
D．A research project.
单项选择题
Why has the return of Discovery been delayed for 24 hours
A．Because of mechanical faults aboard.
B．Because of unfinished work.
C．Because of the bad weather at the landing site.
D．Because of unknown reason.
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