根据网考网考试中心的统计分析，以下试题在2017/10/15日托福考试习题练习中，答错率较高，为：75%
【单选题】 All of the following statements about the tails of comets are true EXCEPT:
A．( They can contain electrically charged or neutral particle
B．( They can be formed only when there is sufficient hea
C．( They are formed before the coma expand
D．( They always point in the direction away from the Su
网考网参考答案：C，答错率：75%
网考网试题解析：
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