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.
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单项选择题
It is true about the media mentioned in the passage that they______.
A．used to sell and buy each other in great numbers
B．are trading each other in greater numbers today
C．used to be controlled by two networks -- ABC and NBC
D．have stopped the trend of acquisitions in the 1990s
问答题
NGVs aren’’t as roomy as gasoline cars because they have to give up cargo and trunk space to accommodate the___________________________________.
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