139. (32262-!-item-!-188;#058&006043)
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
把E项还原以后变成,The rate at which trees grow is believed to be the Among the surest indications on Earth of sunspot cycles ,at which 用来干嘛的,这句话怎么翻译 还有,这里的as seen如何理解 |