单项选择题

A．5 billion years.
B．4 billion years.
C．4.5 billion years.
D．5.4 billion years.
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单项选择题
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.
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.
单项选择题
A．It is nearly worn out.B．It has stains to be cleaned.C．It has holes here and there.D．It is out of fashion.
A．It is nearly worn out.
B．It has stains to be cleaned.
C．It has holes here and there.
D．It is out of fashion.
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