托福考试

【多选题】
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[*] What factors cause frost to form in beautiful patterns on window glass
Click on two answers.
A．The glass is cold on the outside and warm on the inside.
B．The temperature of the glass is below freezing.
C．Impurities on the glass interfere with ice crystal growth.
D．The window is on the north side of the house. Test 6, Track 4
网考网参考答案：B、C
网考网解析：
Frost forms in beautiful patterns on window glass when the temperature of the glass is below freezing: It can look like delicate feathery patterns of crystals on your windowpane... ; ... the temperature of the window glass has to be below freezing. Another factor is impurities on the glass: ...the beautiful patterns of window frost are due to its slightly curved crystals, because of organic impurities on the glass—dust and dirt—that interfere with crystal growth. (2.2) document.getElementById("warp").style.display="none"; document.getElementById("content").style.display="block"; 查看试题解析出处>>