D) More than 600.(C)
20. A) The giant jet will be forced to land.
B) The giant jet will crash.
C) The mechanical pilots will do the job.
D) The engines of the giant jet will stop working.(A)
Part I Listening Comprehension
1. B
2. C
3. C
4. A
5. B
6. D
7. C
8. D
9. A
10. D
11. D
12. B
13. D
14. A
15. A
16. B
17. B
18. C
19. C
20. A
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