---Jimmy, Where are you? Come to help me in the kitchen.---Just a minute, mum. I my bike in the yard.A. repair B. repaired C. am repairing D. have repaired 题目和参考答案——青夏教育精英家教网—

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---Jimmy, Where are you? Come to help me in the kitchen.

---Just a minute, mum. I ________ my bike in the yard.

A. repair B. repaired C. am repairing D. have repaired

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Mobile phone history

Not long ago, mobile phones were used mainly by business people and government officers in society. In the US, mobile phone users were about 340, 000 in 1985. Now there are 205 million mobile phone users in the US. Studies also show that over 50 percent of children in the US own their own personal mobile phones. The mobile phone explosion(激增) has led to a huge number of waste phones. The number of mobile phones users has also increased throughout the world. In the middle of 2005, the number of total users jumped to 2.4 billion worldwide.

Mobile phone waste

When people throw their mobile phones away, they usually end up in the open air. Mobile phones include some materials like lead, mercury and cadmium. They can go into public drinking water and food and do harm to people’s health. About 75 percent of mobile phone users don’t throw their phones away. Instead, they prefer to keep the waste ones sitting around the house as they are not worth very much. People are also afraid that others may know their information if they sell their waste phones. Less than 20 percent of them are recycled each year.

Benefits(益处) of recycling mobile phones

Mobile phones have valuable materials inside. The most valuable material is gold, which is used in the phone circuit boards. Recycling can reduce greenhouse gas emissions (排放物) and keep natural resources like gold. If all of the waste phones in the US are recycled, it will save enough energy to offer over 194, 000 U.S. families electricity(电力) for one year.

How mobile phone recycling works

Many people do not know how mobile phone recycling works. One method of recycling mobile phones is to take the working parts of broken phones, then combine(使结合) them with the working parts of other used mobile phones to make one ready-to-use mobile phone. Another method of mobile phone recycling is to melt(熔化) down and separate parts of the phone, getting the valuable natural resources, such as gold and platinum. Plastic and glass can also be recycled from used mobile phones.

The used mobile phones
Mobile phone history	·Compared with the condition in 1985, there are 1. mobile phone users at present. ·More than 2. of the children in America have their own personal mobile phones. ·It has 3. a huge number of waste phones because of the mobile phone explosion.
Mobile phone waste	·Some materials, such as lead, mercury and cadmium in the mobile phones are 4. to people’s health. ·Three-quarters of the users would rather 5. the waste ones sitting around the house.
Benefits of recycling	·Some materials are of great 6.. They can be used again. ·It can 7. plenty of electricity for American families if the waste phones are recycled.
How recycling 8.	·One way is to join working parts of 9.or used phones together. ·We can also melt down and separate parts of the phone to 10. natural resources.