题目内容：
第50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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