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To show how a common desk fan cools a person, Rhett Allain, a physics professor and writer for Wiredmagazine, performed a simple experiment. He wet apaper towel with warm water and wrapped it arounda thermometer. Allain wrapped a secondthermometer in a dry paper towel. Afterward, he set both thermometers in front of a fan. Initially the fan was turned off. Thetemperature of the thermometer wrapped in the wet paper towel decreased — at first rapidly, then more slowly — and eventually dropped below room temperature. After the fan was turnedon, the temperature of the wet thermometer underwent another rapid decrease. Bycontrast, the temperature of the thermometer wrapped in the dry paper towel barelychanged during the entire experiment. This experiment demonstrated the power ofevaporation to cool wet objects, such as a sweaty person, and the role of a fan in makingevaporation more effective.
Which choice most effectively combines the underlined sentences?
A.Allain wrapped a second thermometer in a dry paper towel, and then he set boththermometers in front of a fan.
B.Wrapping a second thermometer in a dry paper towel, Allain set both thermometers in frontof a fan.
C.Before setting both thermometers in front of a fan, Allain had wrapped a secondthermometer in a dry paper towel.
D.Allain set both thermometers down in front of a fan, but first he wrapped a secondthermometer in a dry paper towel.
答案：A
解析：
Choice A is the best answer because it most effectively combines the underlined sentences. It presents two steps in the experiment in the most logical sequence: First, Allain wrapped a second thermometer in a dry paper towel. Then, he placed the thermometer wrapped in the wet paper towel and the thermometer wrapped in the dry paper towel in front of a fan.
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