23,165→twenty-three thousand, one hundred sixty-five
3,257,890→three million, two hundred fifty-seven thousand, eight hundred ninety
345,216,789,065,443→three hundred forty-five trillion, two hundred sixteen billion, seven hundred eighty-nine million, sixty-five thousand, four hundred forty-three
1,234,567,890→one billion, two hundred thirty-four million, five hundred sixty-seven thousand, eight hundred ninety
12,345,678,901,234,567,890→twelve quintillion, three hundred forty-five quadrillion, six hundred seventy-eight trillion, nine hundred one billion, two hundred thirty-four million, five hundred sixty-seven thousand, eight hundred ninety
(For how to say really big number, go to: http://www.mathcats.com/explore/reallybignumbers.html)
■Talk as they do. (仿说)
Now in groups we shall try to say something about population and its problems. Make use of the information from the conversation we learned just now.
■ Close down by asking and answering conversation questions about environment and pollution.
1. How has the world changed since you were a child?
2. If humans are really clever, why can't they do anything about overpopulation?
3. What are some things that can be recycled?
不错哦 4. What are some ways to reduce pollution in this country?
5. What can you do to make this world a better place?
6. What is the most important issue facing the environment today?
7. What are some ways energy is wasted?
8. What can we do to improve our air quality?
9. How can we protect the environment and at the same time improve people's standard of living?
10. What's happening to forests in your place?
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