托福考试

【单选题】
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[*] Listen again to part of the discussion. Then answer the question.
Why does the professor say this:
A．To warn students not to hang laundry outdoors
B．To find out if the students wash their own clothes
C．To illustrate the same phenomenon in a different way
D．To point out a mystery that scientists cannot explain
网考网参考答案：C
网考网解析：
[解析] Listen again to part of the discussion. Then answer the question. "Excuse me, Dr. West. I’m not sure I heard you correctly. Are you saying it’s possible for ice to form, even when it’s not freezing outside " "Yes, and black ice is a good example of this. The air temperature can be above freezing, but the temperature of a wet surface like pavement can be lower. The same thing happens when wet laundry is left hanging outside and it freezes solid at an air temperature of 35 degrees." Why does the professor say this: "The same thing happens when wet laundry is left hanging outside and it freezes solid at an air temperature of 35 degrees." The professor’s purpose is to illustrate the same phenomenon in a different way. The phenomenon is the formation of ice from water vapor even when it is not freezing outside. Black ice is one example; the freezing of wet laundry is another example. (2.3) document.getElementById("warp").style.display="none"; document.getElementById("content").style.display="block"; 查看试题解析出处>>