句子的整体结构应该是说Medicare covers the full cost of home health care, but (does) not (cover) (the full cost) of other nonhospital services.
A 平行错误；另外，where的用法错误，where引导定语从句的时候，先行词只能是具体的地点名词，排除。
B making beneficiaries pay 20 percent of the costs可以看做伴随状语，修饰整个句子，那么make的主语是medicare，语义不通；也可以看做前面other nonhospital services的后置定语，语义也不通，services本身不能make beneficiaries做什么。
E 同B
D which is unlike other ...如果修饰的是前面的home health care, 意思就成了home health care is unlike other nonhospital services in that ...，两个事之间没有因果关系，又或者一般我们会讲“A不像B，A怎么着怎么着”，不会讲“A不像B，B怎么着怎么着”？
(d) "the possible VERBing" is inferior to "possibly VERBing".
"and" doesn't make sense in context (it makes it seem as though the two effects must occur together); "or" makes more sense.
in general, ACTION NOUNS (adoption, destruction, etc.) don't imply that the subject of the sentence is performing the action; they usually refer to the general notion of that action.
by contrast, -ING forms do usually imply that the subject of the sentence is the actor.
here are two simpler sentences to illustrate:
i want to learn about adopting dogs --> implies that i actually want to adopt dogs myself.
i want to learn about the adoption of dogs --> i want to learn about dog adoption in general, but there is no implication that i actually want to adopt any canines into my own home.
"amount" is a construction that can only be used to refer to UNCOUNTABLE quantities -- i.e., continuous quantities / mass nouns, which are not divided into distinctly countable units.
for instance, you can have an "amount" of water, furniture, etc., but you CANNOT have an "amount" of people, items, etc.
this sentence is very clearly speaking about a countable quantity -- the number (not "amount") of drive-in theaters. since that's countable, any choice with "amount" can be eliminated immediately.
Ron:"twice as many", "one-quarter as many", etc. are not only acceptable as idiomatic expressions but also extremely common in the english language.
since this idiom is present in the correct answer, which was written by gmac, IT IS CORRECT.
In general, you won't need the second half of that construction if you have already mentioned the data elsewhere in the sentence.
the earlier part of this sentence already mentions the # of drive-ins in the u.s. in the 1950's, so it is not stated again. since it is not stated as part of an actual parallel construction, you don't need the second "as".
--
examples:
there were once 20 shirts on this shelf, but, now, barely half as many are left. --> i already mentioned the data (i.e., 20 shirts) earlier in the sentence, so it's not mentioned again.
there are barely half as many shirts on this shelf [i]as there were last week.[/i] --> i didn't mention this comparison point earlier, so i'm mentioning it now.
Think about it this way: x
Difference between y and x is more than 5 so it is at least 6. But x is even and y is odd so their difference would be odd. Hence the diff between them will be at least 7.
Now z is greater than y by at least 2 (since z is odd too), hence diff between x and z is at least 9.
原文African American workers saw the need to join with White workers in seeking change despite White unionists' toleration of or support for racial discrimination.说明他们也知道被歧视，但不得不团结白人工人，E错误
However, recognizing employers' power over workers as a central factor in African Americans' economic marginalization, African American workers saw the need to join with White workers in seeking change despite White unionists' toleration of or support for racial discrimination. 当非裔美国工人意识到employers' power over workers是他们被经济边缘化的中心因素时，他们发现和白人工人一起联合起来寻求变革的必要性，尽管白人工人们歧视他们。C正确
A. processes produce and make it (language) understandable，研究的是“产生语言和使语言可以让人理解的“过程
C. Language is produced and understood by processes. 语义不通，而且，一般说has not revealed ... but ......
A. 未在文中说出明，不能想当然
C. 当时流行的观点是warmblooded，而非intermediate type
D. 注意问法：作者对于这个caution的态度是什么，答案是这个caution小心谨慎的态度是合理的，因为的确有可能是intermediate type
E. C的工作中没有提及intermediate type
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workstation的厂家想降价来给采购带来好处interest。
要求削弱。
这里的buyers for those corporations是公司采购，不是一般的个人买家。
A 对于大多数采购，他们觉得报价低。无关
B 各大厂家的电脑性能都差不多，无关
C 雇了解行情的人当采购，无关
D 投入到workstation上的资源不一样，无关
E 采购拿不到因为谈的采购价远远低于报价的奖金。