单项选择题

A．To discuss the results of the lab experiment.
B．To answer Bob’s question about the lab experiment.
C．To explain the method of collection by water displacement.
D．To prepare the students to do the lab experiment.
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Who is most likely to be the author of the passage
A．A politician.
B．An artist.
C．A doctor.
D．A salesman.
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During the Gulf War American satellites______.
A．tracked Scuds
B．spotted hidden bunkers
C．eavesdropped on whispered orders
D．all above
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