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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
单项选择题
A．Experimental medicines.B．Special treatment centers.C．Flexible working schedule.D．Innovative physical exercises.
A．Experimental medicines.
B．Special treatment centers.
C．Flexible working schedule.
D．Innovative physical exercises.
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