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The World’s Longest Bridge Rumor has it that a legendary six-headed monster lurks in the deep waters of the Tyrhenian Sea be

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问题                     The World’s Longest Bridge
    Rumor has it that a legendary six-headed monster lurks in the deep waters of the Tyrhenian Sea between Italy and the island of Sicily.【R1】______When completed in 2010, the world’s longest bridge will weight nearly 300,000 tons—equivalent to the iceberg that sank the Titanic—and stretch 5 kilmeters long. "That’s nearly 50 percent longer than any other bridge ever built," says structural engineer Shane Rixon.
    【R2】______They’re suspension bridges, massive structures built to span vast water channels or gorges. A suspension bridge needs just two towers to shoulder the structure’s mammoth weight, thanks to hefty(体格健壮的)supporting cables slung(悬吊)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,【R3】______Getting these cables up will be something. It’s not just their length—totally 5. 3 kilometers—but their weight. 【R4】______
    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 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. 【R5】______
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(使一边翘起)the scales(天平)at 166,500 tons—more than half the bridge’s total mass.
G. The world’s longest bridge will be built there.
【R2】
选项
答案B
解析 第二段第二句的主语是They。由于表语是suspension bridges，They替代的一定是前面句子出现过的bridges。六个选项中，只有B含有bridges，且填在第二段段首意思连贯。
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