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【简答题】
The road was hardly ________, but we moved on. recall recognize feature equip visible efficient look after on the way
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举一反三
【单选题】Why is it necessary to extend ventilators of gasoline powered vessels to the bilges ________．
A.
To keep them dry，and thus easier to clean
B.
To remove fuel vapors which are heavier than air
C.
To provide adequate air to the engines
D.
To cool the machinery areas
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