单项选择题

Questions 1 to 5 are based on the following conversation.

A． They are made of warm material.
B． They have a hold for the thumb.
C． They are only for sports.
D． They are first made by a teenager.
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单项选择题
To identify planes flying overhead, the U. S. air-traffic controllers used to _____.
A． get information by communication through phone calls
B． depended on the "war room" for information
C． collect data by way of radar
D． use several computers working at the same time
单项选择题
Paragraph 5 shows that in 1997, people will: ______.
A． not use any electricity
B． use more electricity than they do today
C． use less electricity than they do today
D． keep lights burning after supper indoors
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