单项选择题

One characteristic of weather maps not mentioned by the author in this passage is ______.

A．wind speed
B．thermal changes
C．fronts
D．barometric pressure
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单项选择题
The observation of weather conditions by satellites is advantageous because it ______.
A．gives the scientist information not obtained readily otherwise
B．enables man to alter the weather
C．uses electronic instruments
D．is modern
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