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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