单项选择题

A．He’ll be speaking at the end of the meeting.
B．He was supposed to speak last night instead.
C．He suddenly decided not to speak.
D．He already spoke very briefly tonight.
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单项选择题
A．A sick friend.B．A math class.C．School policy.D．The man’s test.
A．A sick friend.
B．A math class.
C．School policy.
D．The man’s test.
填空题
In terms of chemical structure, the passage mainly discusses three substances. They are ______.
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