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A．People liked cutting down large amounts of rain forests to make all kinds of furniture. B．People need more land to live on. C．People must make more room to build all kinds of buildings to live in. D．People need more wooden products to us E． a and b a and c c and d b and d
A．People liked cutting down large amounts of rain forests to make all kinds of furniture. B．People need more land to live on. C．People must make more room to build all kinds of buildings to live in. D．People need more wooden products to us E． a and b a and c c and d b and d
had been washed away has been washed away were washed away are being washed away
a and b a and c c and d b and d
to tell people that trees are very useful to man to warn people not to cut down trees any more to warn that man mustn't destroy forests any more to explain how trees help to prevent drought and floods
separate suffer stop protect
caused causing to cause being caused
a and b a and c c and d b and d
destroying having destroyed to destroy being destroyed
to destroy destroying destroyed to be destroyed
People spend more time at shopping centers that have trees In hot countries，urban forests are cool places for walking and other healthy exercises But you are not in rural area Trees take pollution out of the air In 2033，it will have 5 million trees It has many kinds of birds in the country
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