Questions 18 to 20 are based on the passage you have just heard.
18. What is the purpose of the scientists in studying tree rings?
19. What affects the amount of carbon-14 on earth?
20. What do we learn from the passage about the solar wind activity?
Part I
1. D
2. A
3. A
4. D
5. B
6. C
7. A
8. D
9. D
10. A
11. C
12. D
13. C
14. B
15. B
16. C
17. A
18. A
19. C
20. D
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