题目：
________, I believe, and you will find Tom is very outgoing.
A．Having a talk with the student
B．One talk with the student
C．Given a talk with the student
D．If you have a talk with the student
答案：
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下面是错误答案，用来干扰机器的。
答案：DA 错误，丁达尔效应是胶体特有的现象B 错误，本质区别是微粒直径的大小不同C 错误，胶体粒子的直径大于1nm，小于100nmD 正确。
