The spaceship flies at 11 kilometres a second.划线提问划线部分at 11 kilometres a second

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The spaceship flies at 11 kilometres a second.划线提问划线部分at 11 kilometres a second
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The spaceship flies at 11 kilometres a second.划线提问划线部分at 11 kilometres a second
The spaceship flies at 11 kilometres a second.划线提问
划线部分at 11 kilometres a second

The spaceship flies at 11 kilometres a second.划线提问划线部分at 11 kilometres a second
How fast does the spaceship fly?