单项选择题

A．He was told to board the wrong plane.
B．He was not allowed to board the plane.
C．He arrived at the airport without a ticket.
D．He found it difficult to explain why he arrived so early.
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单项选择题
A．Because the Earth is heavily polluted.B．Because nature cannot recycle its resources.C．Because there are more and more people living on the Earth.D．Because no more new resources can be added.
A．Because the Earth is heavily polluted.
B．Because nature cannot recycle its resources.
C．Because there are more and more people living on the Earth.
D．Because no more new resources can be added.
单项选择题
A．It remained almost unchanged.B．It was going up slowly.C．It was decreasing.D．It was increasing.
A．It remained almost unchanged.
B．It was going up slowly.
C．It was decreasing.
D．It was increasing.
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