gwd-2-4

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.
            

1. On Earth, among the surest indications of sunspot cycles are believed to be the rate that trees grow
           
2. On Earth, among the surest indications of sunspot cycles are, it is believed, the rate of tree growth
           
3. On Earth, the rate at which trees grow is believed to be among the surest indications of sunspot cycles
           
4. Among the surest indications on Earth of sunspot cycles, believed to be the tree growth rate
           
5. Among the surest indications on Earth of sunspot cycles is believed to be the rate at which trees grow

答案是c，我看网上讨论有说选a，也有说选e的...

E,prep题，答案确定。

C[E]

A、B，are与rate主谓不一致（？）

B、D，tree与后面their trunks不一致

C is the best

E，有人同意E，认为倒装

本题一定要注意到未画线部分的their

谢谢~

可还是应该相信prep上的答案吧。。。，醉兄能解释一下c吗？

C错在修饰对象错误。

the rings visible in the cross sections of their trunks，树的年轮应该修饰树而不是修饰sunspot cycles