Cable TV has experienced tremendous growth as an advertising medium because it has some important advantages. A primary one is

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问题     Cable TV has experienced tremendous growth as an
advertising medium because it has some important advantages. A
primary one is selectivity. Cable subscribers tend to be younger,
more fluent, and better educated than nonsubscribers and have【M1】______
greater purchasing power. Moreover, the specialized programming
on the various cable networks reaches very general target markets.【M2】______
    Many advertisers have turned to cable because of the
opportunities it offers to narrowcasting, or reaching very【M3】______
specialized markets. For example, MTV is used by advertisers in
the United States and many other countries to reach teenagers and
young adults. CNBC is now the worldwide leader in business news
and reaches a highly educated and rich audience. ESPN has
become synonymous as sports and is very popular among【M4】______
advertisers who want to target men of all ages.
    Advertisers are also interested in cable because of its low cost
and flexibility. Advertising rates on cable programs are much
lower than that for the shows on the major networks. Advertising【M5】______
time on network shows can cost two to three times as much on a
cost-per-thousand basis of in some time periods. 25 Spot【M6】______
advertising is also considerately cheaper on most cable stations,【M7】______
while local cable is most affordable television advertising vehicle【M8】______
available. This makes TV a much more unviable media option for【M9】______
smaller advertisers with limited budgets and those interested in
targeting their commercials to a well-refined target audience. Also,【M10】______
cable advertisers generally do not have to make the large up-front
commitments, which may be as much as a year in advance, the
networks require.
【M6】

选项

答案of一去掉of

解析 词汇错误。on the basis of=on a…basis,意为“基于……”,其中on the basis of后面接名词或代词。此处in some time period是介词短语作时间状语,表示“在某些时段内”,不与前面的basis构成搭配。所以此处并不是on the basis of的句型,要将of删掉。
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