______ provides many hours of air for astronauts in space.


  1. A.
    An air tank
  2. B.
    A power pack
  3. C.
    A helmet
  4. D.
    A space sleeping bag
A
考查句意!耙粋氧氣瓶在太空中能給宇航員提供幾個小時的氧氣。”A“氧氣瓶”;B“能量包”;C“一個頭盔”;D“一個太空睡袋”。故選A。
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