Think of all the things you throw away：juice bottles，soda cans，candy covers．It  adds up．How much rubbish do you produce? Americans throw away about 1 ton of rubbish per person every year．That's 2000 pounds of rubbish! Most of the rubbish gets covered in big holes in the round called landfills(垃圾掩埋法)．

    A lot of this rubbish can be recycled，or turned back to something useful．The main things we recycle today are made of metal and paper．

    People recycle for many reasons．One of the main reasons is to protect resources(资源)．Making new cans out of old ones means less aluminum(铝) is needed for new cans．

    This leads to a second reason people recycle：it saves energy．Recycling old aluminum cans take much less energy than making new aluminum．To make new aluminum，you need to mine metal ore(矿石) from the ground，remove it，and refine it，into a finished metal．

    Recycling also protects valuable land．By recycling，we produce less rubbish．That means fewer landfills are needed for dropping our rubbish．Because metals are some what costly to make，they are the world's most recycled materials．About two-thirds of all steel(钢) is recycled．

    Almost all drink cans are made of aluminum．Americans recycle about one-third of their used aluminum cans．Empty cans are sent to special factories．There，they are cleaned，melted，and made into new pieces of aluminum．

    Americans use lots of paper — mostly in the form of newspapers，magazines，and cardboard boxes．In fact，paper takes up more space in landfills than any other material．

    Old paper can be cut and made are into new paper．Americans recycle a little more than one-third of their paper rubbish．New papers are made from trees，each ton of recycled paper saves about 17 trees!

76. You can most probably read the passage in _______．

A．a science book   B．a Chinese book   C．a history book    D．a geography book

77. Which material isn’t mentioned in the passage?

A. Paper           B. Metal            C. Wood            D. Water

78. Why do people recycle rubbish?

A．To protect resources because it's hard to make new resources．

B．It can save energy，because the resources are limited(有限)．

C．To protect valuable land，because there is no place to bury rubbish．

D．To protect resources，save energy and protect valuable land．

79. Which of the following is RIGHT?

A．People recycle paper from the trees．   B．Papers take up less space in the landfills．

C．Americans recycle a little more than 1/3 of their paper rubbish．

D．To recycle paper can't protect the environment．

80. The main idea of the passage is _______．

A．To let us know it is a big job to deal with rubbish． B.To explain the reasons for rubbish recycle．

C．To describe how to recycle metal and paper．

D.  To explain how to recycle rubbish and why to do so．

Taking away a city’s rubbish is a big job. Every day trucks come into a city to collect it. Most rubbish is made up of things we can’t eat or use. If we kept these things we would soon have a mountain of rubbish.
In some cities the rubbish is collected and taken outside of the city to a dump(垃圾站). Often the city dump is placed where the ground is low or there is a big hole. The kitchen rubbish is broken into small pieces and sent into the sewage system. The sewagesystem takes away the used water from toilets, bathtubs(澡盆) and other places.
To keep mice and flies away, some earth is used to cover the newly dumped rubbish. Later, grass may be planted on the rubbish-filled land. Finally, a house or a school may be built there, and then you’d never know that this had once been an old rubbish dump.
In other cities the rubbish is burnt in special places. The fire burns everything but the metal. Sometimes the metal can be used again in factories where things are made of metal. The food parts of rubbish are put in special piles where they slowly change into something called humus(腐殖土), which looks like black earth. It is rich with kinds of things that feed plants and help make them grow.
【小题1】You can most probably read the passage in _______.

Taking away a city’s rubbish is a big job. Every day trucks come into a city to collect it. Most rubbish is made up of things we can’t eat or use. If we kept these things we would soon have a mountain of rubbish.
In some cities the rubbish is collected and taken outside of the city to a dump(垃圾站). Often the city dump is placed where the ground is low or there is a big hole. The kitchen rubbish is broken into small pieces and sent into the sewage system. The sewage system takes away the used water from toilets, bathtubs(澡盆) and other places.
To keep mice and flies away, some earth is used to cover the newly dumped rubbish. Later, grass may be planted on the rubbish-filled land. Finally, a house or a school may be built there, and then you’d never know that this had once been an old rubbish dump.
In other cities the rubbish is burnt in special places. The fire burns everything but the metal. Sometimes the metal can be used again in factories where things are made of metal. The food parts of rubbish are put in special piles where they slowly change into something called humus(腐殖土), which looks like black earth. It is rich with kinds of things that feed plants and help make them grow.
【小题1】You can most probably read the passage in _______.