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.
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小题1:A
小题2:D
小题3:C
小题4:A
小题5:B
小题6:C
小题7:B
小题8:D
小题9:A
小题10:C
题目分析：这篇短文重点介绍了树木的年轮问题,根据数目的年轮我们不仅可以推断出树木的年龄,还可以据此判断它成长中每年的气候状况.
小题1:动词辨析. A.给予;B.要求,问;C.获得,到达;D.告诉,讲述.联系下文,可知此处指的是他们给予我们许多东西,故选A.
小题2:此词辨析. 这几个选项都表示也，其中also，as well，too，用于肯定句，also常用于be动词，情态动词，助动词之后，行为动词之前；as well，too用于句末；either用于否定句中，置于句末。句意:他们也能告诉我们许多关于气候的事情.结合语境可知选D.
小题3:联系下文,可知此处指的是你能看见许多年轮,故选C,环,年轮.
小题4:形容词辨析. A.新的;B.旧的,老的;C.年轻的;D.短的.结合语境可知此处指的是大部分数目每年长一个新的年轮,故选A.
小题5:联系上文,可知我们可以据此知道一棵树多大了,故选B,多大.
小题6:联系上文,可知此处指的是它有超过100多个年轮,故选C,年轮.
小题7:词义辨析. A.大的;B. 瘦的,薄的;C.厚的;D.长的.结合常识可知,在干旱或者非常冷的年份,年轮就特别薄,故选B.
小题8:联系上文,可知此处指的是气候温暖湿润时,故选D,温暖的.
小题9:联系上文,描述,可知此处指的是气候突然的变了.故选A,气候.
小题10:动词辨析.A.思考,认为;B.谈话;C.学习,得知;D.改变.结合语境可知我们可以从此得知100年来的气候问题.故选C.
点评：这篇短文内容比较简单，理解不难。各小题与上下文联系比较紧密，答题中一定要注意联系上下文。答完后多读几遍，看看是否符合逻辑，适当修改。个别小题可以当作单独的词义辨析题来做，先区分词义，结合语境选出最能使语句通顺的答案。