prep139！

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.

(A) On Earth, among the surest indications of sunspot cycles are believed to be the rate that trees grow

(B) On Earth, among the surest indications of sunspot cycles are, it is believed, the rate of tree growth

(C) On Earth, the rate at which trees grow is believed to be among the surest indications of sunspot cycles

(D) Among the surest indications on Earth of sunspot cycles, believed to be the tree growth rate

(E) Among the surest indications on Earth of sunspot cycles is believed to be the rate at which trees grow

1. A中的On earth应该修饰indications,放在句首修饰整个句子，不合逻辑。请问为什么不合逻辑呢?

2. 未划线部分的as seen ...要修饰紧邻的名词，那在正确答案E中它是修饰tree 还是rate，不过感觉两者都说不通阿

希望NN们指教

1.on earth 限制了整句话,可以这么想，作者是想说只在地球上(而不是火星)，indication are believed to be ... 还是在地球上的indications 如何如何，应该是后者吧 On earth是修饰indication的

2应该是修饰rate 从ring中能看出the rate at which trees grow