2. 外语
  3. As we enter the 21st century, a new global economy draws nations ever closer. But our growing interdependence 【21】______ on m

As we enter the 21st century, a new global economy draws nations ever closer. But our growing interdependence 【21】______ on m

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问题      As we enter the 21st century, a new global economy draws nations ever closer. But our growing interdependence  【21】______   on much more than technology and trade.  For we are linked intrinsically by the physical and biological webs that  【22】______   life on our planet -- and, increasingly, by the threat of their unraveling. Indeed,  【23】______   we reach across borders and face this threat together, the next century may  【24】______   an Earth in ecological crisis, with half of all  【25】______   gone, and our grandchildren enduring deadly floods, drought and disease  【26】______   by global warming.
      When millions across America  【27】______   the first Earth Day 30 years ago,  our focus understandably was our own backyard.  Our rivers were  【28】______   on fire, and our skylines were disappearing behind a  【29】______   of smog. American’s remarkable environmental progress in the years  【30】______   is powerful testament to our national will, our technological prowess and our  【31】______   in a better future. Protecting the environment is today a bedrock American value,  【32】______   important to us as safe neighborhoods and good schools. What’s more, three decades of experience have  【33】______   the naysayers wrong. Tending to the environment has not  【34】______   our economy.  【35】______   , our air and water are the cleanest they have been in a generation, even as we enjoy the longest economic  【36】______   in our nation’s history.
     America’s responsibility now, as we mark the first Earth Day of a new millennium, is to bring these lessons to bear against new, more  【37】______   environmental challenges. We must look well  【38】______   our own cities and countryside, make environment a core foreign policy  【39】______   and provide the leadership needed to put all nations on a cleaner, more sustainable path to  【40】______   .
【30】
选项 A、since
B、between
C、from
D、lately
答案A
解析 分析语法可知，句中需要一个副词，首先排除只能作介词的C项。 lately意为“最近，近来”，通常修饰动词；between表示“在两点之间”。句中主要谈到从30年前的第一个地球日以后的时间，所以选since，意为“从那以后”。
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