单项选择题

In the last sentence of the passage, the phrase "these tools" refers to ______.

A．weather forecasts
B．economic advantages
C．mathematics and physics
D．meteorological problems
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单项选择题
Which of the following is referred to by the author as a field whose needs are served by weather forecasting
A．Teaching.
B．Transportation.
C．Medical service.
D．Boxing.
单项选择题
The author implies that increased accuracy in weather forecasting will lead to______.
A．a higher number of professional forecasters
B．less-specialized forms of synoptic meteorology
C．more funds given to meteorological research
D．greater protection of human life
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