2013年12月英语四级考试冲刺翻译练习（七）
87．You__(本来不必进行)all those calculations．We have a computer to do that sort of thing．88．__(中国居于方便面需求榜首)，followed by Indonesia，Japan and the US．
89．Some，green．h0．u，se gases occur naturally in the atmosphere，while others____ __ (由人类的活动造成)．
90．Maintaining proper weight is__(可以采取的最好的步骤之一)to prevent many health conditions and diseases．
91．Hardly had he finished his work____(电话就响了)．
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