答案：B

　　20．A.hard

　　B．complex

　　Cshort

　　D．simple

　　答案：C

　　Ⅴ.阅读理解

　　Most people don't realize it，but cell phones are becoming a huge contribution to pollution on our planet right now.The average American gets a new mobile phone at least every 18 to 24 months.Thus you may buy 34 phones in all during your lifetime if you get your first phone starting at the age of 18，and there are many kids who have them even younger.

　　As part of our“throwaway”society，along with our endless desire for new cell phones，it is estimated(估计) that over 125 million cell phones are thrown away every year.Knowing that the landfill doesn't have to be the end point of your cell phone can greatly reduce the amount of unnecessary waste produced each year.

　　The reason why cell phone recycling is important is that they contain some pretty toxic(有毒的)

　　stuff.But they also contain some nontoxic materials that can be recycled and used again.Yet in reality，we pollute the earth even more by trying to produce these components over again from our limited natural resources.

　　Unfortunately，no landfill is 100% safe.It is the toxins that come from these toxic materials into the ground which pollute our drinkable water supply and affect our health.Currently，less than 1% of the entire earth's water is drinkable，so we must take steps to protect it.

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