A R _ Listening Practice3

Unit 2 Smart Cars

Most people do not know about the dangerous substances in their computers. The computer screen, or

Lead ismonitor, contains about three kilograms of lead. _______

widely known to cause central nervous system problems ________________________________________________

in people, especially puters containother __________________________harmful metals. Computer switches, batteries and wiring are made with small amounts of mercury and cadmium (镉).

Officials in charge of waste say a system is needed to collect old computers for reuse or recycling. But the electronics recycling industry is new and small. Industry_______officialssay they lack the support needed to deal with the ___________________________________________________large number of computers.The Environmental Protection________________________

A R _ Listening Practice4

Unit 2 Smart Cars

Agency now requires large companies to follow rules for dealing with old computers. But recycling industry officials say many businesses fail to obey them. And small businesses and homes in most states are not

included in the rules.

第三单元