单选题
As we enter the 21st century, a new global economy draws nations ever closer. But our growing interdependence (1) on much more than technology and trade. For we are linked intrinsically (本质地) by the physical and biological webs that (2) life on our planet—and, increasingly, by the threat of their unraveling (散开). Indeed, (3) we reach across borders and face this threat together, the next century may (4) an Earth in ecological crisis, with half of all (5) gone, and our grandchildren enduring deadly floods, drought and disease (6) by global warming. When millions across America (7) the first Earth Day 30 years ago, our focus understandably was our own backyard. Our rivers were (8) on fire, and our skylines were disappearing behind a (9) of smog. America's remarkable environmental progress in the years (10) is powerful testament (证明) to our national will, our technological prowess (超凡技术) and our (11) in a better future. Protecting the environment is today a bedrock (基本的) American value, (12) important to us as safe neighborhoods and good schools. What's more, three decades of experience have (13) the naysayers (反对的人) wrong. Tending to the environment has not (14) our economy. (15) , our air and water are the cleanest they have been in a generation, even as we enjoy the longest economic (16) in our nations' history. America's responsibility now, as we mark the first Earth Day of a new millennium (一千年), is to bring these lessons to bear against new, more (17) environmental challenges. We must look well (18) our own cities and countryside, make environment a core foreign policy (19) and provide the leadership needed to put all nations on a cleaner, more sustainable path to (20) .
【正确答案】
A
【答案解析】选项中只有[D]revolves“使旋转”不能与on搭配，通常用法为revolve around“围绕；环绕”，如：a life of leisure revolving around television“以电视为中心的悠闲生活”；其他都可以与on构成搭配。decides on“决定”与lives on“靠……生活”通常用人作主语，在句中不合逻辑，所以选[A]，hinges on意为“依……而定，以……为转移”，如：Everything hinges on his decision.“一切取决于他的决定。”
【正确答案】
D
【答案解析】“使人类联系在一起的自然生物网可以______地球上的生命”，符合逻辑的选项为sustain“支持；供养；继续”，如：sustain a family“养家”，其他不合文意。[A]retain“保存；保留”，如：retain a sense of dignity“保持尊严感”；[B]contain“包含；容纳”；[C]revive“恢复；使复苏”，如：revive sb. with artificial respiration“用人工呼吸使某人苏醒”。
【答案解析】洪水、干旱和疾病是由全球变暖导致的，因此选brought on，意为“使发生；引起”，所引起的事情通常是令人不愉快的，如：a bad cold brought on by going out in the rain“由雨天外出引起的重感冒”，其他选项不合文意或语法。[A]resulted from“产生于”，result是不及物动词，只能用作主动形式，不能用作被动形式；[B]given off“释放”；[C]turned up“开大；出现，到来”。
【正确答案】
C
【答案解析】人们庆祝节日可表达为：celebrate/observe/commemorate/mark/honor a day，所以选[C]，其他选项不合用法。[A]remembered“记住”；[B]cheered“喝彩；欢呼”；[D]proclaimed“宣布；声明”。
【正确答案】
B
【答案解析】四个选项都可以与on搭配，但可以与fire构成动宾关系的只有EA]和[B]。[A]常用作set sth，on fire“使燃烧”，主语通常为人，在句中不合习惯，所以选[B]。catch on fire“着火；开始燃烧”。[C]putting on“穿上；上演”；[D]going(on)“继续；发生”。
【答案解析】根据语法，句中需要一个副词，首先排除只能作介词的[C]from；[D]lately“最近，近来”通常修饰动词，在句中不合语法；[B]between“在……之间”，如：two movies with a newsreel between“由新闻短片连接的两部电影”，句子没有涉及具体的两点，主要关注从30年前的第一个地球日以后的时间，所以选since“从那以后”，如：He at first refused，but has since consented.“他起初拒绝了，但后来同意了。”
【正确答案】
B
【答案解析】选项中只有faith可以和in构成搭配，如：have faith in one's own judgment“相信自己的判断”，其他选项不合搭配。[A]loyalty“忠诚；忠实”，常与to搭配，如：loyalty to one's country“对祖国的忠诚”。[C]prospect“预期；展望”，常与of搭配，如：I delight in the prospect of visiting Beijing.“我欣喜地期待着访问北京。”[D]anticipation“预期；期待”，常与of搭配，如：cut the price in anticipation of a substantial order“预期会有大宗订单而降低价格”。
【答案解析】30年的经验已经证明反对者是错误的，四个选项均有“证明”的含义，但只有prove可用作provesb./sth.wrong/innocent“证明……错误/无罪”；prove还可以用作prove that，其他不合用法。[B]demonstrated“清楚地展示，证明”，常用句型为：demonstrate sth./that；[C]manifested“表明；证明”，后面直接跟宾语，如：manifest the truth of a statement“证明陈述的真实性”；[D]verified“查明某事是否正确”，用法为：verify sth. with sb./verify that，如：verify a theory with examples“用实例证明一个理论”。
【答案解析】作者主张各国要跨越国界共同面对这个威胁(reach across borders and face this threat together)，所以选beyond“(指空间)远于；在……的那一边”，如：look beyond one's staff for counsel“在自己的工作班子以外寻求咨询意见”，其他不合文意。[A]forward“向前”；[B]over“在……上方”，look over“检查”；[D]across“横越；在……的对面”。