Resource-based theory offers an answer, asserting that, in general, firms gain competitive advantages by accumulating resources that are economically valuable, relatively scarce, and not easily replicated. According to a recent study of retail firms, which confirmed that IT has become pervasive and relatively easy to acquire, IT by itself appeared to have conferred little advantage.
But some observers questioned why, if IT had conferred economic value, it did not produce direct competitive advantages for individual firms. Resource-based theory offers an answer...
一些观察质疑如果IT真的产生经济价值，为什么IT没有产生给公司直接的竞争优势。Resourece-based theoty给出了答案
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
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