There are over 58000 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 58000 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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