托福考试

【单选题】
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[*] Why does the professor say this:
A．To explain why only icebreakers can cross the passage
B．To show the difference between ice in winter and summer
C．To illustrate changes in the ice covering theArctic region
D．To describe the dimensions of an average iceberg
网考网参考答案：C
网考网解析：
[解析] Why does the professor say this: "The ice has disappeared at a rate of about 3 percent each decade since the 1970s, and ice sheets that used to be ten feet thick are now less than six feet from top to bottom." The professor’s purpose is to illustrate changes in the ice covering the Arctic region. The ice is disappearing and getting thinner as a result of a temperature rise of 3 to 4 degrees. (2.3) document.getElementById("warp").style.display="none"; document.getElementById("content").style.display="block"; 查看试题解析出处>>