第50题___________

A．But life on the Caribbean Islands is not always paradise.

B．The earliest name used by Europeans is the Indies, later changed to the West Indies.

C．They're like a long necklace that stretches between North and South America.

D．They are Cuba, Puerto Rico, Jamaica, and Hispaniola.

E．This is why millions of tourists visit the islands each year.

F．Some of these islands are no more than tiny slivers (小片) of exposed coral.

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最后一段讲到加勒比海天气温暖，阳光充裕，许多岛屿的海岸有沙滩。这样的自然环境显然会吸引旅游者。故选E。

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1 根据下面短文内容，回答题。

The World's Longest Bridge

Rumor has it that a legendary (传说的) six-headed monster lurks in the deep waters of the Tyrrhenian Sea between Italy and the island of Sicily. __________ (46) When completed in 2010,the world's longest bridge will weigh nearly 300,000 tons---equivalent to the iceberg that sank the Titanic--and stretch 5 kilometers long. "That's nearly 50 percent longer than any other bridge ever built," says structural engineer Shane Rixon.
__________(47) They're suspension bridges, massive structures built to span vast water channels or gorges (峡谷). A suspension bridge needs just two towers to shoulder the structure's mammoth ( 巨大的 ) weight, thanks to hefty ( 高强度的 ) supporting cables slung between the towers and anchored firmly in deep pools of cement at each end of the bridge. The Messina Strait Bridge will have two 54,100-ton towers, which will support most of the bridge's load. The beefy(结实的) cables of the bridge, each 1.2 meter in diameter, will hold up the longest and widest bridge deck ever built.
When construction begins on the Messina Strait Bridge in 2005, the first job will be to erect two 370 meter-tall steel towers.__________ (48) Getting these cables up will be something. It's not just theft length--totally 5.3 kilometers--but their weight.__________(49)
After lowering vertical "suspender" cables from the main cables, builders will erect a 60 meter-wide 54,630-ton steel roadway, or deck--wide enough to accommodate 12 lanes of traffic.
The deck's weight will pull down on the cables with a force of 70,500 tons. In return, the cables yank (拽) up against their firmly rooted anchors with a force of 139,000 tons---equivalent to the weight of about 100,000 cars. Those anchors are essential. __________ (50)
第46题___________

A．Some environmentalists are against the project on biological grounds.

B．What do the world's longest bridges have in common?

C．If true, one day you might spy the beast while zipping (呼啸而过) across the Messina Strait Bridge.

D．They're what will keep the bridge from going anywhere.

E．The second job will be to pull two sets of steel cables across the strait, each set being a bundle of 44,352 individual steel wires.

F．They will tip up the scales at 166,500 tons--more than half the bridge's total mass.

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2 第47题___________

A．Some environmentalists are against the project on biological grounds.

B．What do the world's longest bridges have in common?

C．If true, one day you might spy the beast while zipping (呼啸而过) across the Messina Strait Bridge.

D．They're what will keep the bridge from going anywhere.

E．The second job will be to pull two sets of steel cables across the strait, each set being a bundle of 44,352 individual steel wires.

F．They will tip up the scales at 166,500 tons--more than half the bridge's total mass.

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3 第48题___________

A．Some environmentalists are against the project on biological grounds.

B．What do the world's longest bridges have in common?

C．If true, one day you might spy the beast while zipping (呼啸而过) across the Messina Strait Bridge.

D．They're what will keep the bridge from going anywhere.

E．The second job will be to pull two sets of steel cables across the strait, each set being a bundle of 44,352 individual steel wires.

F．They will tip up the scales at 166,500 tons--more than half the bridge's total mass.

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