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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