- Slides: 13
目录 CONTENTS 01 Listening task 1 02 Listening task 2 03 Practice 04 Homework
Listening Task 1: P 42 The work on early people depends on the dates that are given to the bones found. If the dates are wrong, all the data about early people may also be wrong. So Zhou Heping is very interested to find out how archaeologists make sure their dates are accurate.
1. Listen to the tape and fill the layers in the “ waterpaper basket” diagram on the right. 2. Listen to the tape again. Pay attention to the methods archaeologists use to date bones and how those methods work, then fill in the chart below.
used envelopes wasterpaper Yogurt pot Orange skin
Method How it works 1 Layers in the ground Each layer looks different as they are uncovered, so you can tell where one layer starts and another finishes. In the waste paper basket, the most recent at the layer top is ____, and older layer is below thatbottom and the ______ is oldest at the ______. carbon All living things have disappear ______ in their fixed bodies. When they die, the carbon _______ at a _______ rate. The the amount of 2 Radiocarbon method measures ______ of carbon work out dating in bones or plants using radioactivity and can ______ how old the remains are.
Listening Task 2: P 78 The Terracotta Warriors are one of the greatest Chinese archaeological finds of the 20 th century. Since their discovery in 1974 there has been a great deal of interest in their construction, function, and artistic value. Amanda Peters wants to find out more from her Chinese friend, the archaeologist, Zhou Lei, about how to preserve them.
1. Why is the first problem easier to solve? A The solution is simple B Damp can be easily treated C If only occurs when it is hot D A new form of chemical protection has been invented
2. How does the terracotta army show Emperor Qin Shihuang’s power? A They are all the size of a man B They are a very impressive sight. C There are copies of 8, 000 different men D Emperor Archaeologists think the army is a copy of Qin Shihuang’s real army.
3. What cause the Terracotta Warriors to lose their colour? A Sunlight and temperature changes B Damp and temperature changes C Damp and sunlight D All of the three
4 Why is it not easy to solve the problem of the forty kinds of mould? A They may need different cures B They cannot be removed C There are so many of them D They grew before the excavation