问题补充：
Living in a modern society with more and more out-of-date but still useful computers, many people have to face such a troubling problem: How to deal with those old computers? Some old ones are put away in homes. Many more are just thrown out with the rubbish.
Don’t worry! Some companies are coming up with new ways to cut the number of old computers. Sony, Dell, Hewlett-Packard and other companies now agree to take back some old computers.
In some countries, there are laws about what to do with old computers. By law, computer companies will have to pay for collecting and recycling their used products. And 70% of computer waste must be recycled. The idea behind the laws is that computer companies themselves should pay the cost. That will encourage them to make computers that are easier and cheaper to repair and upgrade（升级）.
While many people are throwing away good computers, others cannot afford them at all. Hundreds of organizations（组织）are working to solve this problem. They collect and repair old computers before sending them to schools, charities（慈善团体）and people who need them. In this way, we can turn one persons rubbish into someone elses useful things-and cut down on waste.
【小题1】What do many people do with old computers?A．They sell them to others.B．They try to repair them.C．They give them to others.D．They stop using them【小题2】According to laws in some countries mentioned in the passage, computer companies must.A．recycle most of their productsB．make their computers cheaperC．repair and upgrade old computersD．collect all their used products【小题3】The last paragraph mainly tells us that hundreds of organizations are working to .A．help the computer companies to collect old ones B．repair old ones and send them to whoever needs them.C．advise people not to throw away good computers.D．encourage people to turn rubbish into useful things.【小题4】What is the main idea of this passage?A．How to repair old computers. B．Avoid producing too many computers.C．Encourage to recycle old computers. D．How to turn rubbish into useful thingsD
答案：
(答案→)D
解析：本文主要讲了以前人们对于过时的旧电脑或者闲置在家里或者扔掉，现在许多电脑公司出台法规回收并利用旧电脑，使旧电脑发挥了作用。
【小题1】根据Some old ones are put away in homes. Many more are just thrown out with the rubbish.
故选D。
【小题2】根据By law, computer companies will have to pay for collecting and recycling their used products. And 70% of computer waste must be recycled.故选A。
【小题3】根据In this way, we can turn one persons rubbish into someone elses useful things-and cut down on waste.故选B。
【小题4】根据全文内容以及In this way, we can turn one persons rubbish into someone elses useful things-and cut down on waste，故选C。
