单项选择题

One of the most obvious advantages of TV is that（）

A．it keeps us informed
B．it is very cheap
C．it enables us to have a rest
D．it controls our lives

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单项选择题

A．Because TV programs are not interesting.
B．Because TV viewers are totally passive.
C．Because TV prices are very high.
D．Because TV has both advantages and disadvantages.

单项选择题

Television, as source of entertainment, is（）

A．not very convenient
B．very expensive
C．quite dangerous
D．relatively cheap