小题1:D
小题2:A
小题3:C
小题4:D
文章介绍了笔记本电脑的用处以及人们在使用的时候锁出现的一些问题。
小题1:D 推理题。根据1,2行The laptop is a machine which can be a mobile office；it can be used to entertain us and people can play computer games on them.可知D正确。
小题2:A 猜测词义题。根据下句Now laptops are lighter，have smaller screen sizes可知现在的笔记本电脑尺寸变得更小了。
小题3:C 推理题。根据Huge display screen laptops are still used by graphic(绘画的)designers and those who like playing computer games.可知大屏幕的笔记本电脑看的更清楚，画的更清楚，故C正确。
小题4:D 细节题。根据最后一段3,4行The reason they do this is that the old one either is broken or has some problems which cannot be fixed.故D正确。