题目

hurt enemy nine necessary compare with 【1】Every man is his own worst ________.【2】It is ________ for us to wash hands before meals.【3】Unluckily, the car driver ________ seriously in the accident.【4】________ the past, shopping online gets more and more popular.【5】In Zhejiang Province, the ________ graders back to school on April l3th. 答案：【答案】【1】enemy【2】necessary【3】was hurt【4】Compared with【5】ninth【解析】【1】句意：一个人最大的敌人就是他自己。根据句子题干可知“his own worst…”在句中做表语，且因“his”为形容词性物主代词，“worst”为形容词，所以所给空需填名词，结合句意和所给词，故填enemy。【2】句意：饭前洗手对我如图所示电路，电源电压8伏保持不变，电阻R1=20欧，当开关S闭合后，电压表V1和V2的示数之比是1：1，V2和V3的示数之比是5：3，则下列判断不正确的是（ ）A．R2=20欧B．R3=30欧C．电流表的示数为0.1安D．电路中消耗的总功率为0.8瓦