题目

Boys and girls, believe in yourselves. The ________ you are, the better grades you'll get.A. more careful B. most carefulC. more carefully D. most carefully 答案：【答案】A【解析】句意：孩子们，要相信你们自己。你们越细心，成绩就会越好。本题考查“the +比较级，the +比较级”结构，you are是主系表结构，因此用形容词的比较级，故选A。一个电灯泡上标有“220V 60W”，它正常发光时灯泡两端的电压是________V，消耗的电功率为________W．该灯泡正常发光10小时消耗的电能为________kW?h．