(
课件网) Section A Understanding ideas decrease 词性：_____ 意思：_____ 词性：_____ 意思：_____ 常用搭配 decrease from… to… 从……减少到…… decrease by… 减少了……decrease to… 减少到…… on the decrease在下降 练习：Our coal output is 4/5 of that of last year—that is, it has decreased _____ 20%. by trap 词性：_____ 意思：_____ 词性：_____ 意思：_____ 常用搭配 be/get trapped(in/on/into…)困于……；陷于…… trap sb. into（doing）sth. 诱骗某人(做）某事 练习：Because of the greenhouse effect the Earth is warmed by gases _____ (trap) in the atmosphere. trapped owe 词性：_____ 意思：_____ 常用搭配 owe sb sth=owe sth to sb欠某人某物；把……归功于某人 our sb a lot/a great deal= owe a lot/a great deal to sb 非常感激某人 owing to 由于 练习：We owe a great deal _____ our parents. to Leading in A delicate world Before reading Activity 1 Activity 1 What animals can you see in the picture Penguins. Before reading Activity 1 What kind of changes would take place if cats, rats and rabbits were introduced to an environment like this They would hunt the birds and eat the native vegetation, thus upsetting the local ecological balance. Fast reading. Match the main ideas with the related paragraphs. Para.1 Para.3 Para.2 Para.4 Para.5 Para.6 A. To protect native animals, invading animals species had to be removed. B. For biological chain, the island's recent story is really a tragic story. C. For some reasons, there were no cats in 2000. D. Macquarie Island is a UNESCO World Heritage Site. E. Because of biological chain, parakeets, the native to the island died out. F. The rat, mouse and rabbit problem should be solved once and for all. Activity 2 Read the passage and find out what happened to Macquarie Island. Non-native species introduced to Macquarie Island attacked native birds, and led to a substantial reduction of bird population and even the extinction of parakeets. In addition, non-native species ate and devastated the native vegetation. All of this played a part in upsetting the natural harmony of the island. But now the island's ecology is on the road to recovery with human efforts. Careful reading. ① Why is Macquarie Island a UNESCO World Heritage Site A. Because it is halfway between Australia and Antarctica. B. Because it is in the South-west Pacific Ocean. C. Because many visitors like to go there. D. Because there are many precious native inhabitants. D ②What is the purpose of the island's introduction of cats A. To kill rats and mice. B. To take over the island. C. To be food for the birds. D. To bring the island colourful. A ③What was the cause of the parakeets' dying out A. Their number was too large. B. The rabbits liked to eat them. C. Too many cats hunted the parakeets. D. The parakeets were eaten up by visitors. C ④When did the island have no cats A. in the 1970s. B. In the 1980s. C. in 2000. D. In 2006. C ⑤Where does this passage probably come from A. A TV interview. B. A biologic ... ...
