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题库 / Prep2007E1-SC-139
On Earth, among the surest indications of sunspot cycles are believed to be the rate that trees grow, as seen in the rings visible in the cross sections of their trunks.
On Earth, among the surest indications of sunspot cycles are believed to be the rate that trees grow
On Earth, among the surest indications of sunspot cycles are, it is believed, the rate of tree growth
On Earth, the rate at which trees grow is believed to be among the surest indications of sunspot cycles
Among the surest indications on Earth of sunspot cycles, believed to be the tree growth rate
Among the surest indications on Earth of sunspot cycles is believed to be the rate at which trees grow
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1-根据句意，说的是the rate is believed，需要主谓一致，排除AB；
2-D选项非完整句子，严重语法错误，排除D；
3-C和E中，查看和题干中之后的句子链接起来是否正确；as seen是一个状语从句，根据定语从句和状语从句这些修饰成分服从就近修饰原则，到前一个句子去找as seen去修饰的成分；C中as seen修饰主句 the rate is believed；E中as seen 修饰which trees grow；根据句意，E的修饰更合理，因此排除C；
4-选E
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