每日一题

Writing & Language

To show how a common desk fan cools a person, Rhett Allain, a physics professor and writer for Wired magazine, performed a simple experiment. After it had been wet with warm water, it was wrapped around a thermometer. Allain wrapped a second thermometer in a dry paper towel, and then he set both thermometers in front of a fan. Initially the fan was turned off. The temperature 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 turned on, the temperature of the wet thermometer underwent another rapid decrease. By contrast, the temperature of the thermometer wrapped in the dry paper towel barely changed during the entire experiment. This experiment demonstrated the power of evaporation to cool wet objects, such as a sweaty person, and the role of a fan in making evaporation more effective.

Which choice makes most clear that a thermometer was wrapped in a wet paper towel?