单项选择题

A．He usually talks quietly.
B．He usually assigns homework.
C．He didn’t teach class today.
D．He noticed that the students didn’t do their homework..
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单项选择题
A．A movie.B．A lecture.C．A play.D．A speech.
A．A movie.
B．A lecture.
C．A play.
D．A speech.
单项选择题
A．The threat of poisonous desert animals and plants.B．The exhaustion of energy resources.C．The destruction of energy resources.D．The spread of the black powder from the fires.
A．The threat of poisonous desert animals and plants.
B．The exhaustion of energy resources.
C．The destruction of energy resources.
D．The spread of the black powder from the fires.
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