As measured by the Commerce Department, corporate profits peaked in the fourth quarter of 1988 and have slipped since then, as many companies have been unable to pass on higher costs.
Thirty rare gases, most of them industrial by-products, threaten to warm the Earth's atmosphere.
这里的most of them industrial by-products这个插入语是怎么回事？既不是同位语，也不是Ving，Ved表伴随。
此类语法困扰我很久了，求大神指点
类似的还有下面这道题的D选项，many companies unable to pass on higher costs也是这种插入语：
184. As measured by the Commerce Department, corporate profits peaked in the fourth quarter of 1988 and have slipped since then, as many companies have been unable to pass on higher costs.
(A) and have slipped since then, as many companies have been unable to pass on higher costs
(B) and have slipped since then, the reason being because many companies have been unable to pass on higher costs
(C) and slipped since then, many companies being unable to pass on higher costs
(D) but, many companies unable to pass on higher costs, they have slipped since then
(E) yet are slipping since then, because many companies were unable to pass on higher costs
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发表于 2013-12-16 00:14:37
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