单项选择题

A．He has stayed on campus.
B．He has been in an academic conference.
C．He has been ill in hospital.
D．He has been on vocation.
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单项选择题
A．The meeting is going on in Room 241.B．The meeting is cancelled.C．The meeting is about space technology.D．The meeting is held in the conference room.
A．The meeting is going on in Room 241.
B．The meeting is cancelled.
C．The meeting is about space technology.
D．The meeting is held in the conference room.
单项选择题
A．One to three million years ago.B．Two to three million years ago.C．One to three billion years ago.D．Two to three billion years ago.
A．One to three million years ago.
B．Two to three million years ago.
C．One to three billion years ago.
D．Two to three billion years ago.
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