Have you ever heard of e﹣waste（电子垃圾）？How do you deal with your Mp4players， mobile phones and your computers when they're broken or you want a new one？
Most people just throw them away． With the（21） of electronic industry， e﹣waste pollution has become a serious problem． According to the UN， in 2014， people around the world produced 41.8million tons of e﹣waste and only（22） less than 20% of it． The USA was（23） waster in the world， producing 7.1million tons． China came second，（24） 6million tons．
It's important to pay attention to e﹣waste． It can be（25） valuable or harmful， depending on what we do with it． E﹣waste is a valuable urban mine（城市矿藏）． The value of the metals， like gold and silver is（26） ． And the metals can be reused， but if people throw them away， the toxic（有毒的） chemicals can（27） the earth or air， they will affect the environment and people's health．
Now， Apple recycles people's used products in China when they're buying new（28） ． The company will test and repair them and then sell them at lower prices．（29） e﹣waste， we can buy longer lasting electronic products． If you don't want your electronics， find a new home for them． You can also take them to see（30） companies can offer recycling programs．
21． A． developing |
B． developed |
C． development |
22． A． recycled |
B． rebuilt |
C． researched |
23． A． big |
B． bigger |
C． the biggest |
24． A． during |
B． with |
C． between |
25． A． both |
B． either |
C． neither |
26． A． amazing |
B． disappointing |
C． boring |
27． A． get up |
B． get into |
C． get on |
28． A． them |
B． those |
C． ones |
29． A． To increase |
B． To reduce |
C． To keep |
30． A． that |
B． where |
C． whether |