In science fiction we read of flying saucers travel through _____ space, so people want to have ______ better knowledge of the universe. 
| A．the; a | B．/; / | C．the; / | D．/; a |
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In science fiction we read of flying saucers travel through _____ space, so people want to have ______ better knowledge of the universe.
| A．the; a | B．/; / | C．the; / | D．/; a |
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