in Tawahka society, kinship ties are a more important indicator of this than are legal property rights, so researchers measured it by a household’s duration of residence in its village. （注意这里的so所表示的逻辑关系）其实就是CR题
better control of other infections such as---后面举例的就应该是control的手段 如果是better control of such infections as--后面举例的就应该是infection，非划线部分的两个例子是感染，所以A的结构是肯定不对的
to investigate what the effects （changes in working conditions would have ）on workers\' performance
断句+化简： to investigate what the effects on worker\'s performance
可不就是没有谓语嘛
what + the effects on 确实没谓语
"what the effects" is ungrammatical.
also, in constructions of this sort, "what" is generally redundant / unnecessary; it's better merely to say "to investigate X" rather than to say "to investigate what X is" (or other such wordy construction).
1. 时态上，AE都有错，主句has／had appeared，后面从句was，就是错误的。这里从句应该与主语时态是一致的。
2 在we have now realized已经是现在完成，意味着在过去某个时间点之前我们都以为ozone是 immune from human influence，自然应该用过去完成时态。
3. it appeared后面加从句it blah blah是redundant，appear作为系动词，后面可以直接加形容词做表语。这样最为简洁清楚。
A: Although the humps probably will not reduce the speed within the speed limit, they can reduce the speed somehow.
B: emergency vehicles- the side effect of the plan. The drawback is not a deal breaker, however, it does not have to be. The key is to attack the plan, but it doesn't necessarily mean to destroy it.
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in Tawahka society, kinship ties are a more important indicator of this than are legal property rights, so researchers measured it by a household’s duration of residence in its village. （注意这里的so所表示的逻辑关系）其实就是CR题