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  3. A long winding road climbs into a gathering dusk, coming to an abrupt dead end in front of a house. Here. a solitary flickering

A long winding road climbs into a gathering dusk, coming to an abrupt dead end in front of a house. Here. a solitary flickering

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问题     A long winding road climbs into a gathering dusk, coming to an
abrupt dead end in front of a house. Here. a solitary flickering flame
casts out a warm glow, illuminated the nearby ridge line of the Malvern【S1】________
Hills.
    Below the light sit a mysterious green contraption resembling a【S2】________
cross between a giant washing machine and a weather station. This is the
UK’S fust dog poo—powered street lamp, and it is generating light in most【S3】________
ways than one.
    The idea seems simple enough：dog walkers deposit the product of
a hearty walk into a hatch and turn a handle. The contents are then
broken by microorganisms in the anaerobic digester, producing methane【S4】________
to fuel the light, and fertiliser. Brian Harper, started work on the【S5】________
machine three years ago after becoming fed up of seeing plump little
bags hung in trees and on grass verges, reckons that 10 bags will power【S6】________
the light for two hours each evening.
  “The gas light captures people’s imagination and shows it dog poo【S7】________
has a value, ”says Harper, who developed the system with funding from
the Malvern Hills Area. “As a result, we get it off the ground, into a
receptacle, and produce something useful. ”The next step is try to【S8】________
interest managers of urban parks in the technology.
    Humans have used animal dung as fuel since the neolithic period,
and have known how to get nonflammable gas from decaying organic【S9】________
matter since the 17th century. Small—scale anaerobic digesters are
commonplace in many developing countries, while larger plants ale【S10】________
producing heat and electricity from animal manure and human sewage
have long been used in the west.  
【S10】
选项
答案去掉are
解析 动词冗余。while引导的状语从句中larger plants为主语，have long been used为谓语，producing heat and electricity from animal manure and human sewage是现在分词短语作后置定语，故删除are。
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