单项选择题

A．At a bookstore.
B．At the dentist’’s.
C．In a restaurant.
D．In the library.
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单项选择题
Conrad and his group of Al researchers have been making enormous efforts to ______.
A．find a roundabout way to design powerful computers
B．build a computer using a clever network of switches
C．find out how intelligence developed in nature
D．separate the highest and most abstract levels of thought
单项选择题
In the passage, the author is trying to tell us______.
A．how TV ads vary vocal sounds to attract attention
B．how the loudness of TV ads is overcome
C．how advertisers control the sounds properties of TV ads
D．how the attention-getting properties of sounds are made use of in TV ads
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