求教1题

jandjshi

E.

A, B用are-错。D,sentence fragment,错. C,On Earth在前面修饰主语或作状语有点awkward + trees 和their trunks距离太远。

E倒装。 正版：The rate at which trees grow, as seen in the rings visible in the cross sections of their trucks, is believed to be among the surest indications on Earth of sunspot cycles.