单项选择题

Questions 11 to 18 are based on the conversation you have just heard.

A．He suddenly decided not to speak.
B．He will speak at the end of the meeting.
C．He was supposed to speak last night instead.
D．He already spoke very briefly tonight.
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单项选择题
A．5 billion years.B．4 billion years.C．4.5 billion years.D．5.4 billion years.
A．5 billion years.
B．4 billion years.
C．4.5 billion years.
D．5.4 billion years.
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