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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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这题我觉得是我遇到的最难的，老师讲完我还没明白。
正常语序：the rate at which trees grow is believed to be among the surest indications of sunspot cycles.
AB: 主谓不一致，不能用are，要用is。
D: 没有谓语动词。
剩下C和E: C里边on Earth做状语修饰is believed动作，这动作发生在地球上；D里边on Earth做定语修饰indications，太阳黑子周期在地球上最确切的表现。作定语更合理。
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