They' re not the world' s tallest or longest bridges，but a string of river crossings made from tree roots are engineering wonders that contain lessons for modern architects.
The town of Cherrapunji in the Khasi Hills is credited with the world record for annual rainfall of over 75 feet!And in this rainy，wet climate，the rubber fig tree grows with abandon.The tree has a secondary root system that grows up above the ground floor and lets the tree easily grow on top of big stones and even out in the middle of streams.Long ago，the Khasis，a tribe in Meghalaya region，realized they could make use of these roots to their own advantage.By controlling and directing the secondary roots，they have created strong living bridges with which to cross streams and rivers by themselves.
To make a tree grow in a certain direction，the tribespeople use the trunks of a betel nut tree whose middle is got rid of，as a guidance system.The thin，tender roots of the rubber tree are placed so they grow in the direction of the tree trunk rather than fanning out.Eventually，the roots reach the other side of the river and grow into the soil.This process can take well over a decade before the bridge is fully functional and then over time the bridge grows and strengthens.Rocks are placed along the bridge's sides to improve the footpaths.
Some of these bridges are over 100 feet long and can even support the weight of fifty or-more people at a time.These bridges are used daily by the people of the villages around Cherrapunji and a few are thought to be more than 500 years old.There is even a double decker bridge，known as the "Umshiang Double-Decker Root Bridge"，which features two bridges grown right on top of each other.It is thought to be the only bridge of its kind.
（1）What do we know about the bridges in Meghalaya？ AA
A．They resemble the fig tree roots.
B．They're works of modern architects.
C．They take a very short time to build.
D．They're constructed by the villagers.
（2）How is a betel nut tree used in building the bridges？ AA
A．It plays the role of a guide.
B．It bears the weight of the bridge.
C．It protects the surface of the bridge.
D．It delivers materials across the river.
（3）What does the third paragraph mainly describe？ BB
A．A complex system.
B．A construction process.
C．A scientific theory.
D．A natural landscape.
（4）What makes the "Umshiang Double-Decker Root Bridge" unusual？ CC
A．Its history.
B．Its material.
C．Its shape.
D．Its length.
【答案】A；A；B；C
【解答】
【點(diǎn)評(píng)】
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發(fā)布：2024/4/20 14:35:0組卷：7引用：1難度：0.5
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