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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.
A
A.that the universe began in an explosive instant（爆炸性瞬间） 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（根据语境 后面用现在完成时会更好）
C.that the beginning of the universe was an explosive instant 10 to 20 billion years ago that has expanded （不是instant has expanded）
D.the beginning of the universe to have been an explosive instant 10 to 20 billion years ago that is expanding （用that来说明一件事会更好）
E.the universe to have begun in an explosive instant 10 to 20 billion years ago and has been expanding （用that来说明一件事会更好）
2.（174）Often major economic shifts are so gradual as to be indistinguishable at first from ordinary fluctuations in the financial markets.
C
A.so gradual as to be indistinguishable （indistinguishable？可区分的）
B.so gradual so that they can be indistinguishable (so…so that …)
C.so gradual that they are unable to be distinguished
D.gradual enough not to be distinguishable enough not to 很奇怪
E.gradual enough so that one cannot distinguish them （one指代什么）
3.（175）Experts estimate that ten times as much petroleum（石油） exists in sources like tar sands, heavy oil, and perhaps even in shale than in conventional reservoirs.
D
A．sources like tar sands, heavy oil, and perhaps even in shale than（as…as…）
B．sources like tar sands, heavy oil, and perhaps even in shale than are（as…as…）
C．such sources as tar sands, heavy oil, and perhaps even in shale as are
D．such sources as tar sands, heavy oil, and perhaps even shale as（省略了much petroleum exists）
E．such sources as tar sands, heavy oil, and perhaps even shale than（as…as…）
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发表于 2022-9-29 20:00:27
