Question

　　You are going to read something about tree rings .There may be some new words, but you can guess their meaning according to the picture.

　　As a tree grows, it produces new layers of wood around the trunk (树干) , just under the bark. If a tree is cut down, the layers are visible in a cross section. The layers are called tree rings.

　　We can learn many things from the tree rings. Most trees grow one new ring each year. Because of this we can know the age of a tree. But the tree does not grow at same speed all year. It grows very quickly in spring and summer, slowly in autumn and winter. The light ring is larger because it is the spring and autumn growth, the dark ring is the slow autumn and winter growth. So when you look at the rings, one year is a light and dark ring together. To find the age of the tree when it is cut down just count the dark rings. The oldest ring is the small one in the middle and the youngest is the last ring just below the bark.

　　The size of tree rings are different each year, that depends upon the environmental conditions(条件) that the tree experiences. For most area tree rings will be wider(更宽的) during years of plenty of rain and narrower(更窄的) during times of little rain. Sometimes the rings are closer together on one side of a tree and wider apart on the other. That’s because one side of the tree has grown faster than the other. Trees like all plants need light and space to grow, maybe this kind of trees have been on the edge(边缘) of the forest and received more light.

　　1. Look at the picture below, it’s part of the tree ring, we can know the age of the tree is

　　A. 14 B. 28 C. 29

　　2. The ring just below the bark is the ring of a tree.

　　A. earliest B. widest C. latest

　　3. Which tree may live at the edge of the forest?

　　A. B. C.

　　4. If the ring of 1998 is wider than that of 2000, that means .

　　A. there is less rain in 2000 than in 1998

　　B. the winter is colder in 1998 than in 2000

　　C. there is one more day in 2000 than in 1998

　　5. According to the passage, which statement is NOT TRUE?

　　A. A tree grows at the same speed each year.

　　B. If you want to know the age of a tree, you can count the layers.

　　C. We can get some information about the climate in the pass from the tree rings.

Answer 1

1A  2C  3A  4A  5A