题目内容
（请给出正确答案）
If lighthouses are public goods, then free markets would______.
A．create a lighthouse monopoly
B．provide the optimal number of lighthouses
C．provide more than the optimal number of lighthouses
D．provide less than the optimal number of lighthouses
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更多“If lighthouses are public good…”相关的问题
A．the coast was straight and unobstructed
B．ships there had high masts
C．coastal waters were safe
D．the lighthouses were bulb on high Places
A．Built
B．Building
C．Been built
D．Having built
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.
Besides lights, lighthouses today have ______.
A．fire
B．horns
C．lamps
A．the coast was straight and unobstructed
B．ships there had high masts
C．coastal waters were safe
D．the lighthouses were built on high places
根据下列材料，请回答题
The first navigational lights in the New World were probably lighthouses 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 lighthouses erected on the West Coast in the 1850s 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 were made of stone and brick， others of wood or metal. Some stood on pilings or stilts; some were fastened to rock with iron rods. Farther south， from Maryland through the Florida Keys， the coast was 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. 190 feet high， it is the tallest brick lighthouse in the country.
Not with standing differences in construction appearance， most lighthouses in America shared several features: a light， living quarters， and sometimes a bell （or， later， a foghorn）. They also had 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 walk of life， 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.
Which is the best tide for the passage？ 查看材料
A.The Lighthouse on Little Brewster Island.
B.The Life of a Lighthouse Keeper.
C.Early Lighthouses in the United States.
D.The Modern Profession of Lighthouse-keeping.
Why does the author mention the Massachusetts Bay Colony？
A．It was the headquarters of the United States Lighthouse Board.
B．Many of the tallest lighthouses were built there.
C．The first lantern wicks were developed there.
D．The first lighthouse in North America was built there.
Why does the author mention the Massachusells taay Colony？
A．The first lantern wicks wete develop(!d ttleYe．
B．It was the headquarters of the Unitedl Stales IAghthouse Board．
C．Many of the tallest lighthouses were build there．
D．The first lighthouse in North Ameriea was buill there．
The First Navigational Lights
In the New World the first navigational lights 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 on ships, the original beacon was blown up in 1776. By then there were only a dozen of so true lighthouses in the colonies. Little over a century later, there were 700 lighthouses.
The first eight lighthouses 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 built on rocky eminences, enormous towers were not the rule. Some were made of stone and brick, others of wood or metal. Some stood on pilings or stilts; Some were fastened to rock with iron rods. Farther south, from Maryland through the Florida Keys, the coast was low and sandy, it was often necessary to build tall towers there, massive structures like the majestic Cape Hatteras, North Carolina lighthouse, which was lit in 1870. At 190 feet, is the tallest brick lighthouse in the country.
Notwithstanding differences in appearance and construction, most American lighthouses shared several features: a light, living quarters and sometimes a bell (later, a foghorn). They also had something else in common, a keeper and usually, the keeper's family. The keeper's essential task was trimming the lantern wick in order to maintain a steady, bright flame. The earliest keepers came from every walk of life ; 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 lighthouses was taken over in 1852 by the United States Lighthouse Board, an agency of the Treasury Department, the keeper gradually became highly professional.
What is the best title for this passage？
A．The Life of a Lighthouse Keeper
B．The Modern Profession of Lighthouse Keeping
C．Early Lighthouse in the Unites States
D．The Lighthouse on Little Brewster Island
阅读材料，回答题：
The first navigational lights in the New World were probably lanterns hung at harbor en-trances. The first lighthouse was put up by the Massachusetts bay Colony in 1716 on Little brew-ster 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 adozen or sotrue lighthouses in the colonies. Little over acentury later， there were 700 lighthouses.
The first eight lighthouses erected on the West Coast in the 1850s featured the same basicNew England design:aCape Cod dwelling with the tower rising from the center or standing closeby. In New England and elsewhere， though， lighthouses reflected avariety of architectural styles.
Since most stations in the Northeast were set up on rocky eminences （高处）， enormous towerswere not the rule. Some were made of stone and brick， others of wood or metal. Some stood onpilings or stilts; some were fastened to rock with iron rods. Farther south， from Maryland throughthe FloridA．Keys， the coast was low and sandy. It was often necessary to build tall towers there——massive structures like the majesticlighthouse in Cape Hatteras， North Carolina，which was lit in1870. 190 feet high， it is the tallest brick lighthouse in the country.
Not withstanding differences in construction appearance， most lighthouses in Americasharedseveral features : alight， living quarters， and sometimes abell （or， later， afoghorn）. They alsohad something else in common: akeeper and usually the keeper"s family. The keeper"s essentialtask was trimming the lantern wick （灯芯） in order to maintain asteady， bright flame. The earli-est keepers came from every walk of life， they were seamen， farmers， mechanics， rough millhands 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 Lighthouseboard， and agency of the Treasury Department， the keeper corps gradually became highly profes-sional.
Which is the best title for the passage？ 查看材料
A.The Lighthouse on Little brewster Island.
B.The Life of aLighthouse Keeper.
C.Early Lighthouses in the United States.
D.The Modem Profession of Lighthouse-keeping.
