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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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遇到这道题，真的是死得其所了···
among是介词，放在前面显然是一个倒装句，真正的主语应该是the rate，所以企图将 the surest indications of sunspot cycles 当成主语 后面谓语用复数形式的都错；排除AB；（D顺带排除一下，句子结构混乱）
然后看CE，C on earth 的说法我觉得有点勉强，或者换句话说，在实战里面很难在2min内判断；
不如从语法解释，as seen ....正如被看到的xxx，什么被看到，如果是C，就是sunspot cycles····显然不对的；直接排除C
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