答题卡背面切勿乱涂乱写●包训国无论是高考，还是平时的模拟考，总有不少考生在答题卡背面乱涂乱写，更有甚者把答题卡背面当成草稿纸使用。这一不良现象应引起广大师生的高度重视。众所周知，高考答题卡是由机器来阅卷评分的。当电脑工作时，背面的无效信号被透视到答题... Do not scramble and write on the back of the answer card. ● Whether it is the college entrance examination or the usual mock exam, there are always many candidates who scrawl on the back of the answer card. What is more, they use the back of the answer card as scratch paper. This unfavorable phenomenon should arouse great attention from teachers and students. As we all know, the college entrance examination answer sheet is scored by the machine. When the computer is working, the invalid signal on the back is perspective to the answer...