托福考试

根据网考网考试中心的统计分析，以下试题在2017/12/13日托福考试习题练习中，答错率较高，为：99%
【单选题】 Which of the following does the passage mainly discuss
A．( Chemical causes of ice ages
B．( Techniques for studying ancient layers of ice in glaciers
C．( Evidence of a relationship between levels of carbon dioxide and global temperature
D．( Effects of plant life on carbon dioxide levels in the atmosphere

网考网参考答案：C，答错率：99%
网考网试题解析：
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