For computer users, there is no bigger excitement than tossing out your old PC and upgradi

For puter users, there is no bigger excitement than tossing out your old PC and upgrading to a newer, faster and cleaner machine. With hardware designers like Intel, pushing newer, faster products every year, and new software requiring even more powerful machines, panies and consumers have little choice but to go along.
But this rapid turnover is having a serious effect on the planet. Producing a personal puter consumes large quantities of natural resources. A recent study by the United Nations estimates the energy required to produce a single new puter is equivalent to nearly two barrels of oil. And that doesn't include the 22 kg of chemicals or the 1,500 kg of water used in the manufacturing process.
In fact, pound for pound（均等地）, the process for making a car is about 500% more efficient than that for making a puter. That doesn't matter so much 20 years ago when personal puters were few and far between, but times have changed. These days, puters are found nearly everywhere and sales continue to grow. The number of PCs in use topped one billion in 2002.
Waste in production is only half the problem. Old puters, especially the monitors, are full of dangerous substances, which need to be carefully recycled. The problem is sure to expand over the ing years as users replace their boxy CRT monitors with LCD flat displays.
Europe now requires that 70% of parts from old puters be recycled, but the study’s authors say that’s also part of the problem. The solution, they insist, is for governments and panies to encourage people to use their puters longer, and upgrade rather than replace. But considering that much of the world’s recent economic growth has e from spending on puters and information technology, that advice may sound like wishful thinking. 
【小题1】What do puter users have to do every few years according to the passage?
A. Push newer, faster products.
B. Produce more powerful machines.
C. Consume large quantities of natural resources.
D. Upgrade to a newer, faster puter.
【小题2】What does the underlined word “that” in paragraph 3 refer to?A．The pound.B．The process. C．The car.D．The puter.【小题3】We can infer from the last paragraph that     .A．governments and panies will surely encourage people to use their puters longerB．governments and panies will probably encourage people to replace their personal putersC．the world's economic has been growing without people's spending on puters and information technology D．all parts from old puters are now recycled in Europe【小题4】The purpose of writing this passage is      A．to encourage panies to push newer, faster personal putersB．to encourage people to design more new software C．to encourage people to save their personal putersD．to encourage people to spend more money on puters and information technologyD