_______ provides many hours of air for astronauts in space.
A.An air tankB.A power packC.A helmetD.A space sleeping bag
A
考查句意!耙粋(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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