题文
The successful launch of Tiangong1 symbolizes a further step for China to join in the________of space stations previously mastered by Russia and the US.
| A．invention | B．production |
| C．operation | D．preparation |
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The successful launch of Tiangong1 symbolizes a further step for China to join in the________of space stations previously mastered by Russia and the US.
| A．invention | B．production |
| C．operation | D．preparation |
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