34. According to the passage, why are scientists working on the expandable space habitats?
(A) To deal with Hollywood.
(B) To deal with financial issues.
(C) To deal with the maze.
(D) To deal with engineers.
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統計: A(2), B(47), C(8), D(7), E(0) #1308521
統計: A(2), B(47), C(8), D(7), E(0) #1308521