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1.(173)The widely accepted big-bang theory holds that the universe began in an explosive instant 10 to 20 billion years ago and has been expanding ever since.
选A
A.that the universe began in an explosive instant 10 to 20 billion years ago and has been expanding
B.that the universe had begun in an explosive instant 10 to 20 billion years ago and had been expanding ever since用现在完成时
C.that the beginning of the universe was an explosive instant 10 to 20 billion years ago that has expanded 爆炸还在扩大不对,前面已经是一般过去时了
D.the beginning of the universe to have been an explosive instant 10 to 20 billion years ago that is expanding 时态错误,用过去时,且wordy
E.the universe to have begun in an explosive instant 10 to 20 billion years ago and has been expanding holds the universe to??
2.(174)Often major economic shifts are so gradual as to be indistinguishable at first from ordinary fluctuations in the financial markets.
错选E
A.so gradual as to be indistinguishable 系表结构表示事物性质,正确
B.so gradual so that they can be indistinguishable so...so that错误
C.so gradual that they are unable to be distinguished shifts不能用able to do,不是shift没有能力被区分
D.gradual enough not to be distinguishable not位置错误
E.gradual enough so that one cannot distinguish them enough和so that连用错误
3.(175)Experts estimate that ten times as much petroleum exists in sources like tar sands, heavy oil, and perhaps even in shale than in conventional reservoirs.
选D
A.sources like tar sands, heavy oil, and perhaps even in shale than like不能用于举例
B.sources like tar sands, heavy oil, and perhaps even in shale than are like不能用于举例
C.such sources as tar sands, heavy oil, and perhaps even in shale as are and两边不平行
D.such sources as tar sands, heavy oil, and perhaps even shale as
E.such sources as tar sands, heavy oil, and perhaps even shale than as much...than错误
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