完型填空
　　We know that trees are useful in our everyday life. They (1)______ us many things, such as wood, oxygen, rubber, medicines and many other things. They can (2)_____ tell us a lot about our climate. The following are the reasons. If you (3)______ a tree, you can see that it has many rings. Most trees grow one new ring (4)______ year. Because of the 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 or very cold, the trees do not grow very much and their rings are usually (7)______. When it is wet and warm, the rings are much thicker. If the rings are suddenly very thin or suddenly very thick, this means that the (8)_______ changed suddenly. If we look at the rings on this tree, we can learn about the (9)______ for a hundred years. We can see (10)_____ our climate is changing today.
　　( )1. A. tell B. ask C. give D. get
　　( )2. A. not B. too C. to D. also
　　( )3. A. cut across B. climb up C. walk past D. look at
　　( )4. A. every B. many C. the first D. from
　　( )5. A. how big B. how long C. how old D. how much
　　( )6. A. trees B. leaves C. people D. rings
　　( )7. A. big B. thick C. small D. thin
　　( )8. A. climate B. trees C. rings D. animals
　　( )9. A. people B. things C. climate D. life
　　( )10.A. how B. why C. when D. while
名师解析
　　这是一篇说明文，文章主要介绍了年轮的形成与作用。
　　1.C. 这里所指的many things就是树木所提供给我们的，因此这里用动词 give 比较合理。
　　2.D. 根据所给的四个词的意思可知答案。
　　3.A. 只有将树从中间断开，才能看到年轮的。
　　4.A. 年轮是每年生长一圈的。
　　5.C. 根据年轮我们是可以得出树龄的。
　　6.D. 根据上句话，一百年的树木一般是有一百个年轮。
　　7.D. 当树木生长得慢的时候，年轮自然就会薄的。
　　8.A. 年轮的突然变化意味着气候的变化，因为气候的变化影响着树木的生长。
　　9.C. 解释同上。
　　10.A. 这里用how 比较合理，因为通过年轮可以看出气候的变化情况。