托福考试

根据网考网考试中心的统计分析，以下试题在2019/4/7日托福考试习题练习中，答错率较高，为：79%
【单选题】
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Listen to a part of a lecture in an ecology class.

Why does the professor say this
A．To describe the importance of runoff and groundwater.
B．To compare the amount of runoff with that of groundwater.
C．To show similarities between runoff and groundwater.
D．To explain how runoff eventually becomes groundwater.

网考网参考答案：A，答错率：79%
网考网试题解析：
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