题目

检验培养基是否有杂菌污染的最有效方法是( )A. 将未接种的培养基放在实验桌培养B. 将未接种的培养基放在窗台培养C. 将未接种的培养基放在恒温箱中培养D. 将已接种的培养基放在恒温箱中培养 答案：【答案】C【解析】试题将未接种的培养基和接种的培养基一起放在恒温箱中培养，这样可以对比分析出培养基是否被杂菌污染。故选CWhile shopping, people sometimes can’t help _______ into buying something they don’t really need. A. to persuade　 　　B. persuading C. being persuaded　　 D. be persuaded