单项选择题

The expression "ripple effect" (Line 6, Para. 1) most probably means " ______ ".

A．chain reaction
B．cumulative effect
C．immediate response
D．long-lasting impact
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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
According to the passage, some have criticized the changes because they ______.
A．ignore local and state taxes
B．were not discussed in public
C．are not in accordance with federal law
D．leave many families unable to pay for college
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