The passage focuses on comets primarily in terms of their [br] It can be infer

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问题 The passage focuses on comets primarily in terms of their [br] It can be inferred from the passage that the nucleus of a comet is made up of

选项 A、dust and gas
B、ice and dust
C、hydrogen gas
D、electrically charged atoms

答案 B

解析

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ThepassageonthefollowingpageshassevensectionsA-G.Choosethecorrecthe