单项选择题

Three (51)______years ago Daniel Gabriel Fahrenheit made his (52)______thermometer in his home town of Danzig (Now Gdansk in Poland). The thermometer was filled with (53)______ and completely sealed, but it was not much use without some sort of (54)______to measure the temperature.
One story (55)______that, during the winter of 1708--1709, Fahrenheit took a measurement of 0 degrees as the coldest temperature outdoors--which would now read as minus 17.8℃. Five years (56)______he used mercury instead of alcohol for his (57)______, and made a top reference point by measuring his own body temperature as 90 degrees. Soon afterwards he became a glassblower, (58)______allowed him to make thinly blown glass tubes that could be marked up with more points on the scale and so (59)______accuracy.
Eventually he took the (60)______point of his temperature scale from a reading made in ice, water and salt, and a top point made from the boiling point of water. The scale was recalibrated using 180 degrees between these (61)______points and Fahrenheit was able to make much more accurate and more (62)______measurements of temperature.
But in 1742 a rival challenged the Fahrenheit scale and (63)______superseded it. Anders Celsius, in Sweden, invented a scale of 100 degrees between the freezing and boiling points of water and gradually (64)______over many countries. However, the British (65)______wedded to Fahrenheit until well into the 20th century.

64（）

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