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．He quit his job to go back to school.B．He was recently laid off from his job.C．He is working fewer hours these days.D．He can no longer depend on his parents.
A．He quit his job to go back to school.
B．He was recently laid off from his job.
C．He is working fewer hours these days.
D．He can no longer depend on his parents.
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