[解析]
(1)B.细节理解题。根据第一段Computers are useful machines.They can help peoplea lot in their daily life.(计算机是有用的机器,在日常生活中它能帮助人们很多。)可知电脑是有用的机器,因为它能够帮助人们很多。故选B。
(2)C.细节理解题。根据第三段So many teachers and parents complain (抱怨) that computers can not help children to studybut make them fall behind.(许多老师和家长抱怨,电脑不能帮助孩子们学习,而是让他们落后。)可知老师和家长抱怨电脑不仅没有帮助孩子的学习,反而使他们落后了。故选C。
(3)A.细节理解题。根据第四段They say computers let millions of people lost their jobs or bring them a lot of trouble.Will computers really bring trouble to people or can they bring people happiness?(他们说电脑让数百万人失业或给他们带来很多麻烦。电脑真的是带给人们麻烦还是给人们带来幸福?)可知电脑也给人们带来麻烦。故选A。
(4)B.细节理解题。根据最后一段Will computers really bring trouble to people or can they bring people happiness?lt will be decided by people themselves.(电脑真的会给人们带来麻烦,还是能给人们带来幸福?它将取决于人们自己。)可知电脑是否能帮助孩子学习,取决于怎么去利用电脑,所以是很难说的。故选B。