Section A: 1-7

　　1. B) Safety concerns.

　　2. D) It plays an important role in thenation’s economy.

　　3. C) To rescue two sick American workers.

　　4. A) The darkness and cold.

　　5. D) With a full-sized helicopter.

　　6. B ) He has rich experience in flying.

　　7. C ) Do something fun and creative.

　　Section B: 8-15

　　8. D) To arrange the delivery of a package.

　　9. C) She is not at home.

　　10. B) He will be working somewhere else.

　　11. A) Sign her name.

　　12. B) Study abroad

　　13. C) Rather depressed

　　14. D) He has to finish an assignment

　　15. A)Say goodbye to the woman at the airport

　　Section C: 16-25

　　16. C)Its height changes with each volcanic eruption.

　　17. D) They make good fields for farming.

　　18. B) They feed on certain small mammals.

　　19. A) He is self-employed.

　　20. B) Loving the work they do.

　　21. A) It does not come to anything without hard work.

　　22. C) It evolved in the mid-1970s.

　　23. C) She hated to see her idling about.

　　24. A) After she started teaching English.

　　25. B) It has made her happy and energetic.