单项选择题

A．It’’s time to urge him to study math.
B．He himself should make the decision.
C．They should help him study math.
D．They should leave right now.
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问答题
Too frequent exposure to the kind of material discussed in the passage causes the viewer or reader to ___________
单项选择题
Many commercials begin with a cheerful song of some kind because ________.
A．pop songs attract viewer attention
B．it can increase their loudness
C．advertisers want to make them sound different from regular programs
D．advertisers want to merge music with commercials
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