B. The earth’s atmosphere is made up of oxygen and nitrogen.
C. The earth had dissolved the harmful atmosphere into the oceans and seas.
D. Plants provide oxygen to the earth.
(4) What is the passage mainly about?
A. The appearance and development of life on the earth.
B. The birth of the earth.
C. Why dinosaurs died out.
D. The fact that human beings caused global warming.
Suggested answers: (1)A (2)D (3)D (4)A
3. Reading and discussion
Read the text a third time and then work in pairs to discuss the following questions.
1) Why was the earth different from the other planets?
2) Why did the plants grow before the animals came?
3) Why is it wrong to show films with dinosaurs and people together?
4) There used to be nine planets in the solar system. Recently scientists have decided that one of them can no longer be considered a planet. Do you know the name of that planet? Do you know why they removed it?
5) What problem is caused by human beings?
(Let students have enough time to read the passage carefully and discuss the questions with their partners. Encourage them to express their own ideas. )
4. Explanation
Help students analyze some difficult, long and complex sentences and guess the meaning of some new words. Encourage them to try to deal with the language points in the context.
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