We know that trees are useful in our everyday life. They 1us many things, such as wood, ox

We know that trees are useful in our everyday life. They   1   us many things, such as wood, oxygen(氧气), rubber, medicines and many other things. They can   2   tell us a lot about our climate. The following are the reasons. If you cut across a tree, you can   3   that it has many rings. Most trees grow one   4   ring every year. Because of this reason, we know   5   a tree is. A tree over a hundred years old means that it has more than a hundred   6  . When the climate is dry(干燥的) or very cold, the trees do not grow very much and their rings are usually   7  . When it is wet and   8  , the rings are much thicker. If the rings are suddenly very thin or suddenly very thick, this means that the    9   changed suddenly. If we look at the rings on the trees, we can   10   about the climate for a hundred years. We can see how our climate is changing today.
【小题1】A．give B．askC．getD．tell【小题2】A．too B．as wellC．eitherD．also【小题3】A．hearB．feelC．see D．look【小题4】A．newB．old C．youngD．short【小题5】A．how tallB．how oldC．how long D．how far【小题6】A．leavesB．applesC．ringsD．trees【小题7】A．bigB．thinC．thick(厚的)D．long【小题8】A．coldB．cool C．hot D．warm【小题9】A．climateB．thingsC．peopleD．life【小题10】A．thinkB．talkC．learnD．changeA