三 文意選填 10 % (忽略大小寫) (AB) placed(AC) gradually(AD)attractions(AE) locations(BC) risked (BD) many (BE)elsewhere (CD) commonly (CE) warn (DE)light (ABC) materials   Before the invention of electricity, sea travel was quite risky. It was very difficult for sailors to find safe entries into harbors. Some ancient sailors used burning volcanoes to   47   their way.   48    , friends would often build fires on the tops of hills to lead their loved ones safely home. Then   49   people began constructing tall towers with bright lamps   50     inside a glass-enclosed top. Lighthouse keepers would make sure the lamp burned brightly throughout the night.   This task often involved climbing as   51     as 200 steps three times a night! Lighthouse keepers were dedicated workers who   52     their lives saving the lives of others. Lighthouses were   53   built at certain harbor entrances or on dangerous stretches of coastline. From these different   54    , lighthouses would either guide ships or   55     them off because of approaching danger.  Many historic lighthouses can still be found around the world. They are constructed from a variety of 56 and have different shapes, styles and features.
【題組】47