单项选择题

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

A．mathematics and physics
B．weather forecasts
C．meteorological problems
D．economic advantage
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单项选择题
Which of the following is not referred to by the author as a field whose needs are served by weather forecasting
A．Sports.
B．Transportation.
C．Manufacturing.
D．Fanning.
单项选择题
Which of the following is NOT true according to the passage
A．Skyscrapers provide more usable space than other buildings.
B．The skyscrapers first appeared in the late 1960's.
C．Where there are skyscrapers, television reception is poor.
D．The two World Trade Center towers are skyscrapers.
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