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請依下文回答第 51 題至第 55 題： Traveling through waterways is definitely the oldest and one of the most efficient ways of travel,but not necessarily the smoothest. The need for a system for an endangered ship to seek help while itis 51 in the middle of an ocean has been felt ever since the first voyage happened. Since long,various forms of emergency signals have been used. One of the most commonly used 52 signalis maritime signal flares. These flares when fired 53 a minute indicate a ship in extreme dangerand asking for help. This, however, is the form used today, an earlier version of 54 wasdeveloped by Martha Coston based on a framework laid by her deceased husband around 1850s.Coston’s system underwent many modifications and was later 55 by the American marineservices and standardized to be used all over America. Thanks to Coston’s invention, ships now hasmuch more to rely on when they run into troubles in the ocean.
51
(A) stranded
(B) strangled
(C) struggled
(D) stumbled

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