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
此题选C，是因为A,D,E都缺少主语吗？
Q33:
When an active tooth in the shark’s jaws is lost or worn down, many spare teeth lie in seemingly limitless reserve, each of which are ready to slide into the appropriate position.
A. When an active tooth in the shark’s jaws is lost or worn down, many spare teeth lie in seemingly limitless reserve, each of which are ready to slide into the appropriate position.
B. Whenever an active tooth is lost or worn down, many spare teeth lie in seemingly limitless reserve in the shark’s jaws, which are each ready to slide into the appropriate position.有疑问，他、应该是语意的合理性
C. Many spare teeth lie in seemingly limitless reserve in the shark’s jaws, each one of which are ready to slide into the appropriate position when an active tooth is lost or worn down.
D. The many spare teeth lying in seemingly limitless reserve in the shark’s jaws, each one of which is ready to slide into the appropriate position whenever an active tooth is lost or worn down.
E. In the shark’s jaws, many spare teeth lie in seemingly limitless reserve, each one ready to slide into the appropriate position whenever an active tooth is lost or worn down.
我可以排除掉B,C,D. 不明白A为什么不对??? E中each one 指代的是reserve吗？
第一题的D没有主语，A E均是倒装句!
第二题没有谓语，many spare teeth lie in seemingly limitless reserve中的lie in seemingly limitless reserve是spare teeth 的后置定语
Q4, 主语应该是the rate,后面它才可以as seen in the rings visible in the cross sections of their trunks。
Q33,A的逻辑不对，当active tooth掉了时，spare teeth就lie in seemingly limitless reserve,后面修饰。但事实是不管active tooth掉了没有，spare teeth永远都是lie in seemingly limitless reserve。所以这么拍结构读不通。
E中的each on指代spare teech
第一题的D没有主语，A E均是倒装句!
第二题没有谓语，many spare teeth lie in seemingly limitless reserve中的lie in seemingly limitless reserve是spare teeth 的后置定语
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