单项选择题

As used in the first paragraph, terrain most clearly means ______.

A．available information about the weather
B．surrounding land area
C．blank spaces between the mountain ranges
D．amount of forest per square mile
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单项选择题
Information about cities, vegetation, and road overlying the terrain ______.
A．has to be eliminated before correct readings can be obtained
B．would be impossible to convert to data that a computer would accept
C．might lead to new applications and improve effectiveness of present uses
D．would make ray tracing obsolete
单项选择题
The author feels that a comparison of liquid and solid-fuel rockets shows that ______.
A．neither type is very economical
B．the liquid-fuel rocket is best
C．each type has certain advantages
D．the solid-fuel rocket is hest
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