we know that trees are useful in our everday life.they ( ) us manywe know that trees are useful in our everday life.they ( ) us many things,such as wood,oxygen,rubber,medicines and many other things.they can（ ）tell us a lot about our climate.the

we know that trees are useful in our everday life.they ( ) us manywe know that trees are useful in our everday life.they ( ) us many things,such as wood,oxygen,rubber,medicines and many other things.they can（ ）tell us a lot about our climate.the
we know that trees are useful in our everday life.they ( ) us many
we know that trees are useful in our everday life.they ( ) us many things,such as wood,oxygen,rubber,medicines and many other things.they can（ ）tell us a lot about our climate.the following are the reasons.if you( )a tree ,you can see that ir has many rings.most trees gro one new ring( ) year.because of this reason,we know( )a tree is.a tree over a hundred years old means that it has more than a hun dred( ).when the climate ids dry or very cold,the trees do not grow very much and their tings are usually( ).when it is wet and warm,the rings are much thicker.if the tings are suddenly very thin or suddenly very thick,this means that the ( )changed suddenl

we know that trees are useful in our everday life.they ( ) us manywe know that trees are useful in our everday life.they ( ) us many things,such as wood,oxygen,rubber,medicines and many other things.they can（ ）tell us a lot about our climate.the
we know that trees are useful in our everday life.they ( provide ) us many things,such as wood,oxygen,rubber,medicines and many other things.they can（also ）tell us a lot about our climate.the following are the reasons.if you(were )a tree ,you can see that ir has many rings.most trees gro one new ring(every ) year.because of this reason,we know( how old)a tree is.a tree over a hundred years old means that it has more than a hun dred(rings ).when the climate ids dry or very cold,the trees do not grow very much and their tings are usually(thinr ).when it is wet and warm,the rings are much thicker.if the tings are suddenly very thin or suddenly very thick,this means that the (climate )changed suddenl
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we know that trees are useful in our everday life.they ( give ) us many things,such as wood, oxygen,rubber，medicines and many other things.they can（also ）tell us a lot about our climate.the following...

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we know that trees are useful in our everday life.they ( give ) us many things,such as wood, oxygen,rubber，medicines and many other things.they can（also ）tell us a lot about our climate.the following are the reasons.if you(were )a tree ,you can see that ir has many rings.most trees gro one new ring(every ) year.because of this reason,we know( how old)a tree is.a tree over a hundred years old means that it has more than a hun dred(rings ).when the climate ids dry or very cold,the trees do not grow very much and their tings are usually(thinr ).when it is wet and warm,the rings are much thicker.if the tings are suddenly very thin or suddenly very thick,this means that the (climate )changed suddenly

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we know that trees are useful in our everday life.they (give ) us many things,such as wood, oxygen,rubber，medicines and many other things.they can（ aslo ）tell us a lot about our climate.the following...

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we know that trees are useful in our everday life.they (give ) us many things,such as wood, oxygen,rubber，medicines and many other things.they can（ aslo ）tell us a lot about our climate.the following are the reasons.if you(cut across )a tree ,you can see that ir has many rings.most trees grow one new ring( every ) year.because of this reason,we know(how old )a tree is.a tree over a hundred years old means that it has more than a hundred( rings ).when the climate is dry or very cold,the trees do not grow very much and their rings are usually( thin).when it is wet and warm,the rings are much thicker.if the tings are suddenly very thin or suddenly very thick,this means that the ( climate )changed suddenlgive

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F/A-22是美国空军研制的新一代战斗机，也是除美国的F-35以外目前唯一面世的“第四代战斗机”，它将成为21世纪初的主战机种。它的任务包括：夺取制空权，向美军作战提供空中优势，在战区空域有效实施精确打击；防空火力压制和封锁、纵深遮断，近距空中支援。与第三代战斗机相比，F/A-22飞机最具里程碑意义的技术特性是：采用全隐身与气动综合布局、持续的超音速巡航能力、过失速机动、短距起降、先进的机载设备和...

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F/A-22是美国空军研制的新一代战斗机，也是除美国的F-35以外目前唯一面世的“第四代战斗机”，它将成为21世纪初的主战机种。它的任务包括：夺取制空权，向美军作战提供空中优势，在战区空域有效实施精确打击；防空火力压制和封锁、纵深遮断，近距空中支援。与第三代战斗机相比，F/A-22飞机最具里程碑意义的技术特性是：采用全隐身与气动综合布局、持续的超音速巡航能力、过失速机动、短距起降、先进的机载设备和火控系统与综合航空电子系统。

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give
also
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every
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1give 2 also 3cut across 4every 5how old 6rings 7thin 8climate 9climate 10how

we know that trees are useful in our everday life.they ( give ) us many things,such as wood, oxygen,rubber，medicines and many other things.they can（ also ）tell us a lot about our climate.the following...

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we know that trees are useful in our everday life.they ( give ) us many things,such as wood, oxygen,rubber，medicines and many other things.they can（ also ）tell us a lot about our climate.the following are the reasons.if you( cut )a tree ,you can see that ir has many rings.most trees gro one new ring( each/every ) year.because of this reason,we know( 这句话有问题，在查查原文 )a tree is.a tree over a hundred years old means that it has more than a hun dred( rings ).when the climate ids dry or very cold,the trees do not grow very much and their tings are usually( thin/narrow ).when it is wet and warm,the rings are much thicker.if the tings are suddenly very thin or suddenly very thick,this means that the ( weather )changed suddenly.if we look at the rings on this tree ,we can learn about the( weather )for a hundred years.we can see( how )our climate is changing today.

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