题目

阅读下面材料，在空白处填入适当的内容(1个单词)或括号内单词的正确形式。The goal of early calculating machines was to 【1】(simple) difficult sums. But with the help of new technology, electronic chips replaced tubes and a revolution of artificial intelligence has arisen. From then on, 【2】appearance of computers totally changed our lives. They can not only download information from the net when 【3】(connect) by the network or mobile phone signals, but also solve different 【4】(type) of logical problems. With operators as their coaches, they can even co铁、铝是生活中常见的金属，铝的金属活动性比铁强，但铝制品却不易锈蚀，原因是________，洗涤铝制品时注意________．