問題詳情

Part IV. Reading Comprehension Passage #1    Every year, billions of tons of soil are washed away by floods that destroy farmland andentire hillsides are undermined by violent storms. To combat this potentially catastrophicerosion, governments around the world have used giant walls of concrete and stone to propup mountains and reinforce riverbanks.     William Louey thinks there may be a better approach. Louey runs a Hong Kongengineering company that claims success with an environmentally-friendly material calledGeofiber, a kind of soil mixed with fiber. Instead of burying nature in concrete, engineers areusing Geofiber to make slopes that are strong enough to resist landslides and fertile enough tosupport vegetation and wildlife. Geofiber has one more advantage. Water may becometrapped behind a concrete wall and may eventually damage it. Geofiber allows water to drainnaturally, which reduces pressure on a slope.
31. The conventional wisdom to deal with the problem of landslides is to build a _____ wall.
(A) wooden
(B) sandy
(C) concrete
(D) plastic
(E) steel

參考答案

答案：C
難度：非常簡單1
統計：A(0),B(0),C(3),D(0),E(0)

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