down upon by colleagues. D. They may be considered professionally petent. 24. According to the speaker, what is the second disadvantage for people who change their jobs too often? A. They may be considered dishonest. B. They may be considered professionally petent. C. They may be considered not clever enough. D. They may be considered too ambitious. 25. What does the speaker finally say about people who change their jobs too often? A. They may have a good team spirit. B. They are unlikely to be self-centered. C. Both A. and B. D. Neither A. nor B. Questions 26 to 30 are based on the following passage or dialog. 26. Why does one of the aliens stay on the Earth? A. It wants to continue to collect vegetation samples. B. It has been caught by U.S. government agents. C. Other aliens dislike it.
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