問題詳情

The city of Toledo, Ohio, in a pilot project, is adopting so-called "green infrastructure" techniques toalleviate storm water run-off and to reduce basement flooding in residential areas. (16)___ money from thefederal government, the city transformed the existing grassy areas between the sidewalk and street into anatural storm water drainage system, and (17)___ it with native plants, flowers, and shrubs. These newareas, or bioswales, as they’re known, are actually designed for floods, not flowers. To create a bioswale,they dug a shallow ditch, then filled it with layers of gravel and soil that (18)___ rainfall to drain into theground instead of overflowing into the sewers. These strips were planted with grasses and deep-rootedgroundcover to further aid (19)___. Shortly after the project was completed, Toledo got its first big storm.The bioswales on Maywood Avenue absorbed the rainwater, (20)___ houses just one street over wereflooded. What’s happening on Maywood Avenue is a great model for other green infrastructure projects.London has just put in a bioswale at the 2012 Olympic Park.
16.
(A)Over
(B) With
(C) For
(D) As

參考答案

答案：B
難度：簡單0.865385
統計：A(1),B(45),C(2),D(4),E(0)

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