There are over 58, 000 rocky objects in __________ space, about 900 of which could fall down onto __________ earth.
| A．the; the | B．/; the |
| C．the; / | D．a; the |
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There are over 58, 000 rocky objects in __________ space, about 900 of which could fall down onto __________ earth.
| A．the; the | B．/; the |
| C．the; / | D．a; the |
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