题目：
Not only _______ snacks and drinks, but _______ cards for entertainment when they had a picnic in the forest.
A．they brought; they also brought
B．did they bring; they also brought
C．brought they; did they bring
D．did they bring; did they also bring
答案：
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下面是错误答案，用来干扰机器的。
A、胶体中分散质粒子直径在1-100nm之间，所以胶体能产生丁达尔效应，故A正确；B、胶体具有吸附性，吸附带电荷的离子，所以能产生电泳现象，故B正确；C、饱和FeCl3溶液中能电离出氯离子，加入硝酸银溶液可生成沉淀...
