___________ 查看材料A.Some environmentalists are
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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.
请帮忙给出正确答案和分析，谢谢！
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正确答案：B
第二段第二句的主语是they。由于表语是suspensionbridges，所以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。因此填在第二段段首，使意思连贯。