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课件网) Unit 7 The secret of memory 沪教牛津版八年级上册 主题范畴： 人与自我；人与自然 Focusing on culture What things can “remember” things Human beings have the ability to remember the past. The ruins witness the history of China. The moments help us record colorful life. The wrinkles represent the experience of the worker. The diary keeps our feelings. The coins witness the rise and fall of a dynasty. 1.What is this 2. Look at the picture. What can you see from the picture Rings of trees. It is a tree trunk. In one way, nature is also able to remember past events. wide ring 宽的 narrow ring 狭窄的 scar 伤疤 first year growth What do they mean 过去的事情 Reading Read the article about tree rings to learn what they can tell us. Scientists have long studied tree rings. This branch of science is called dendrochronology. Experts in this field use tree rings to learn more about our world. They compare tree rings from different trees in the same area to collect data about the past. Notes / dendr kr 'n l d / 树木年代学 领域 比较 The memories of trees Do trees have memories This may seem like a strange question, but trees can actually tell us things about the past. When a tree is cut down, you can see something special inside: rings. These rings are the memories of trees. Tree rings contain lots of secrets from the forest. Every year the tree grows, there is a new ring. Scientists can count the rings to tell the age of the tree. They also study tree rings to learn about the climate and the environment. Tree rings are a record of the climate. Some rings are quite wide. This is a good sign as it means the tree grew well and was healthy. This happens when the tree gets enough sun and rain. When it doesn’t rain enough, the tree won’t grow as much, and the rings are narrow. Thanks to this, scientists can look at the tree ring patterns to learn about climate change in a particular place. Scientists also look at tree rings to study natural disasters. For example, sometimes there is a black area on a tree ring. This usually means there was a forest fire. If scientists count the rings from the black area, they can answer difficult questions, such as “When did the fire happen ” and “How common are forest fires ” Tree rings can also help us understand human history. For example, scientists can use tree ring patterns to learn the age of old buildings. Nowadays, they can even look at the chemistry of each tree ring to figure out exactly when the tree was cut down. Thanks to this new method, a team of archaeologists discovered that a Viking village in Canada was built in the year 1021 CE. It’s amazing that trees can tell us so much, even though they cannot talk! Read the title and the first paragraph and answer. 1. What’s the main idea of the passage Tree rings contain lots of secrets from the forest. 2.How does the writer start the passage The writer starts the passage by asking a question. ① ② ③ ... ...
