单项选择题

The article was written to explain______.

A．the greenhouse effect
B．the solar effects on the earth
C．the models of solar weather interactions
D．the causes affecting weather
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单项选择题
The FCC's new policy regarding media alliances is that______.
A．it allows companies to sell their stocks publicly
B．it doesn't allow companies to sell their stocks publicly
C．it permits one company to own more media businesses at the same time
D．it has eliminated all post-1980 companies
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
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