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_______ provides many hours of air for astronauts in space.

A．An air tank

B．A power pack

C．A helmet

D．A space sleeping bag

考查句意。“一個(gè)氧氣瓶在太空中能給宇航員提供幾個(gè)小時(shí)的氧氣。”A“氧氣瓶”；B“能量包”；C“一個(gè)頭盔”；D“一個(gè)太空睡袋”。故選A。

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