19．
Have you ever heard of e-waste （electric waste），which can be produced every day？How do you deal with your computers，MP4players and mobile phones when they're broken or you want a new one？
Most people just throw them away．With the development of electric industry，e-waste pollution has become a serious problem．According to the United Nations，in 2014，people around the world produced 41.8million tons of e-waste and only recycled 6.5million tons．The US was the biggest waster，producing 7.1million tons．China came second，with 6million tons．
It's important to pay attention to e-waste．It can either be valuable or harmful，depending on how we deal with it．E-waste is a valuable urban mine（城市礦藏）．The value of the metals，like gold and silver in the waste around the world，is amazing．And the metals can be reused．But if people throw them away，the harmful chemicals can get into the earth or air，polluting the environment around us and affecting people's health．
Apple，for example，now recycle people's used products in China when they are buying new ones．The company will test and repair the used ones and sell them at lower prices．To help reduce e-waste，we can also take computers and phones to see if companies offer recycling programs．
49．Which of the following can become e-waste？A
A．Computers．
B．Vegetables．
C．Clothes．
D．Plastic bags．
50．According to the passage，how much e-waste did China produce in 2014？D
A.41.8million tons．
B.6.5million tons．
C.7.1million tons．
D.6million tons．
51．If you buy a new mobile phone，what shouldn't you do with the old one？A
A．Throw it away immediately．
B．Repair the old one．
C．Sell it at a lower price．
D．Take it to a recycling company．
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