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  3. The first navigational lights in the New World were probably lanterns hung at harbor entrances. The first lighthouse was put up

The first navigational lights in the New World were probably lanterns hung at harbor entrances. The first lighthouse was put up

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问题      The first navigational lights in the New World were probably lanterns hung at harbor entrances. The first lighthouse was put up by the Massachusetts Bay Colony in 1716 on Little Brewster Island at the entrance to Boston Harbor. Paid for and maintained by "light dues" levied (征收) on ships, the original beacon was blown up in 1776. Until then there were only a dozen or so true lighthouses in the colonies. Little over a century later, there were 700 lighthouses.
     The first eight lanterns erected on the West Coast in the 1850’s featured the same basic New England design: a Cape Cod dwelling with the tower rising from the center or standing close by. In New England and elsewhere, though, lighthouses reflected a variety of architectural styles. Since most stations in the Northeast were ’set up on rocky eminences (高处), enormous towers were not the rule. Some of them were made of stone and brick, others of wood or metal. Some of them stood on pilings or stilts; others were fastened to rock with iron rods. Farther south, from Maryland through the Florida Keys, the coast is low and sandy. It was often necessary to build tall towers there--massive structures like the majestic lighthouse in Cape Hatteras, North Carolina, which was lit in 1870. At 190 feet, it is the tallest brick lighthouse in the country.
     Notwithstanding differences in construction appearence, most lighthouses in America shared several features: a light, living quarters, and sometimes a bell (or later a foghorn). They also had quarters, and something else in common: a keeper and usually the keeper’s family. The keeper’s essential task was trimming the lantern wick (灯芯) in order to maintain a steady, bright flame. The earliest keepers came from every industry--they were seamen, farmers, mechanics, rough mill hands--and appointments were often handed out by local customs commissioners as political plums. After the administration of lighthouse was taken over in 1852 by the United States Lighthouse Board, and agency of the Treasury Department, the keeper corps gradually became highly professional.=
It can be inferred from the passage that lighthouses in the Northeast did NOT need high towers because ______.
选项 A、ships there had high masts
B、coastal waters were safe
C、the coast was straight and unobstructed
D、the lighthouses were built on high places
答案D
解析 第二段第三句可知，东北海岸的灯塔一般都建在高处，因此灯塔本身并不高。
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