Questions 6 to 8 are based on the passages you have just heard.
A. . Ceres and Mars.
B. . Ceres and Vesta.
C. . Vesta and Mars.
D. . Mars and Jupiter.
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A. . Life.
B. . Water.
C. . Ice.
D. . Atmosphere.
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A. . They were made of rock, and covered with ice.
B. . They were orbiting around the planet Jupiter.
C. . They stopped growing in the process of becoming full-size planets.
D. . They stopped growing into full-sized planets because of their size.
Part IIIDirections:In this section, you'll hear some long conversations. At the end of each conversation, some questions will be asked. Both the conversation and the questions will be spoken only once. After each question, choose the best answer from the four choices marked A, B, C, and D.Questions 9 to 11 are based on the conversation you have just heard.[音频]
A. . Exploring the universe.
B. . Traveling in the space.
C. . NASA shuttle flight plans.
D. . Unemployment at NASA.
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A. . Expensive and dangerous.
B. . Cheap and commonplace.
C. . Dangerous but convenient.
D. . Expensive but worthwhile.
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