单项选择题

A．The woman will record tonight’’s program.
B．He will be having a meeting with his boss at that time.
C．His boss might ask him to stay up late.
D．He may have to prepare for tomorrow’’s business trip.
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单项选择题
The greenhouse effect resulted hundreds of million years ago when _________.
A．the atmosphere changed dramatically
B．oxygen levels on the earth became lower
C．the sea levels became lower greatly
D．the sediment gave off enormous carbon and methane
单项选择题
A．To escape from their enemies.B．To catch more food.C．To use their developing flippers.D．To swim.
A．To escape from their enemies.
B．To catch more food.
C．To use their developing flippers.
D．To swim.
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