by contrast, if the sentence had contained "many of them", then it would be a run-on.
so:
*i adopted two dogs, they weigh approximately 100 pounds each
is a run-on sentence (--> incorrect). for the same reason,
*i adopted two dogs, each of them weighs approximately 100 pounds
and
*... a population of only 4 million people, many of them are members of hill tribes...
would also be run-on sentences (--> incorrect).
more than three times as many 【independent institutions of higher education charge tuition and fees of under $8,000 a year 】as 【 ( independent institutions of higher education) charge over $16,000】
Their guild was composed not of family units but of individual women who enjoyed unusual legal and economic privileges. 女裁缝协会并不是由家庭为单位，而是以享受着不同寻常的法律和经济特权的女性构成。
choice b, 这些被家庭雇佣的女裁缝们不允许协助男裁缝去缝制男装。-> 没法得到
句子作用题However, the actual relationship between these environmental factors and the diversification of life forms is not yet fully understood
为了说明geological changes 可以导致 life diversification, 但是具体是如何运作的还需要更多的研究来解释
直接细节题： in this instance, rather than leading to large-scale extinctions, these kinds of environmental changes may have resulted in an enriched pattern of habitats and nutrients, which in turn gave rise to the Ordovician radiation
This rock record provides clues about one of the most significant radiations (periods when existing life-forms gave rise to variations that would eventually) evolve into entirely new species) in the history of marine invertebrates
C
* the placement of 'on earth' again, the sentence seems to be saying that residents of other planets disagree with us).
* 'as seen in the rings...' is a modifier that must be placed next to the thing that it modifies, which is 'the rate at which trees grow'. the way choice c is currently written, it says that indications of sunspot cycles can be seen directly in the rings - and it also implies that sunspot cycles (instead of trees) have rings!
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描述的是睡姿，不是猴子本身具有像晾衣杆上的袜子那样的属性，而是应该是修饰sleep的