The first man known to use a signal other than a bonfire(大篝火)used a chandelier(枝形吊灯). He was lord of a castle that stood near a rocky seacoast. .He hang the chandelier, containing many --71-- large tallow candles ,in the highest tower of his castle . Thus he warned passing ship from the danger --72-- along the coast. Candles soon became the common fuel for signal lights. They were later replaced by oil lamps, that could burn longer and brighter. Kerosene and --73-- gas lamps also tried .These are still in use now in --74-- some smaller lighthouses. But today most lighthouses sent electric light blazing out over the sea. --75-- The ancient fire signals could only say “Danger! Keep off !”But the modern lighthouse also identifies it in a code known to all shipping .Most of --76-- the great lights have their own special signals. The light may be one that blinks—as a giant firefly in the --77-- night .Or it may be a revolved light that is red and --78-- then green. Or it may be only white .But however --79-- the signal ,it is sent very regularly. A ship within its range is never at a loss to know it is , and where it is being located . --80--
答案： 71． hang 意作“悬挂”时，时态变化“hang，hung，hung”；意作“吊死，该死”时，时态变化为“hang ，hanged ，hanged”。此处作“悬挂”讲，且全篇叙述都用的是过去时，所以应该使用过去式hung。 72． “warn sb of sth ”为固定搭配，所以将from改成of。 73． 定语从句中，如先行词后出现逗号，为非限制性定语从句，则关系代词应用which。 74． “tired”不是动词，是分词形式的形容词。一个句子中不可能没有谓语动词，所以填上一个“were”，因为“be tired”表示“劳累”。 75． “B.ut today ”暗示这句话应转为现在时，所以应把过去式sent改成现在时send。 76． “modern lighthouse”辩认identify 的对象是它自己，所以应该使用反身代词itself。 77． 此句意思是“light”像“giant firefly ”，as不表示“像”的意思，所以将其改成like。 78． 动词变成形容词修饰名词时，如果与名词是主谓关系，动词变成-ing形式，如果与名词是动宾关系，动词变成过去分词形式。“light”与“revolve”应是主谓关系，所以应用动名词形式revolving来修饰名词light。 79． How 与however后面直接接形容词，然后再加名词，如：How beautiful the flowers are ！what 与whatever后面直接接名词，如：What beautiful flowers！此句应用whatever，因为 其后紧跟着一个名词“the signal”。 80． and 前后句子结构对称，“ it is ”与“where it isolated”对称，不需要being。另外，此处强调的是状态，不是动作，“being”表示正在定位于何处。
it
