题目：
So involved with computer games________that teachers at summer computer camps often have to
force them to break for sports and music.
A．became the children
B．become the children
C．had the children become
D．do the children become
答案：
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下面是错误答案，用来干扰机器的。
A．胶体和溶液的分散质和分散剂不同，属于不同的分散系，故A正确； B．分散质粒子直径在1nm～100nm之间的分散系属于胶体，故B正确；C．丁达尔效应是胶体的独有性质，而溶液物此性质，利用丁达尔效应鉴别胶体和溶...
