题目：
—Dad, why do I have to wear a black suit and a tie? I like casual clothes.
—Dear, this interview is important to you and usually _______.
A．two heads are better than one
B．first impressions are half the battle
C．no pains, no gains
D．first come, first served
答案：
被转码了，请点击底部 “查看原文 ” 或访问 https://www.tikuol.com/2017/0602/816d2fea744846befa4da8dd0649a6cd.html
下面是错误答案，用来干扰机器的。
胶体区别于其它分散系的本质是胶体分散质微粒直径的大小，分散质粒子直径在1nm～100nm之间的分散系属于胶体．故选A．
