People have always searched the sky for clues about upcoming weather. Throughout the ages,
farmers and sailors have looked to the winds and clouds for signs of approaching storms. But no
real understanding of the weather could be achieved without a scientific study of the atmosphere.
Such a study depends on being able to measure certain conditions, including pressure, temperature,
and moisture levels.
A true scientific examination of weather, therefore, was not possible until the development of
accurate measuring instruments, beginning in the 17th century. Meteorology — the science of
studying the atmosphere — was born in 1643 with the invention of the barometer, which measures
atmospheric pressure. The liquid-in-glass thermometer, the hydrometer to measure humidity — the
amount of moisture in the air — and the weather map also were invented during the 1600s.
With the measurement of these basic elements, scientists began to work out the relationships
between these and other atmospheric conditions, such as wind, clouds, and rainfall. Still, their
observations failed to show an overall picture of the weather. Such complete weather reporting had
to wait two centuries for the rapid transfer of information made possible by the invention of the
telegraph during the 1840s.
【題組】50. According to the passage, complete weather reporting _______________.
(A) failed to show the overall picture of the weather
(B) was not made possible until the 17th century
(C) became possible after the invention of the telegraph
(D) had to wait two centuries for the weather map to be developed
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