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．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.
单项选择题
A．On the walls of caves.B．On a heavy clay tablet.C．On woods.D．On cloth.
A．On the walls of caves.
B．On a heavy clay tablet.
C．On woods.
D．On cloth.
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