The following questions present a sentence, part of which or all of which is underlined. Beneath the sentence, you will find five ways of phrasing the underlined part. The first of these repeats the original; the other four are different. If you think the original is best, choose the first answer; otherwise choose one of the others.
These questions test correctness and effectiveness of expression. In choosing your answer, follow the requirements of standard written English; that is, pay attention to grammar, choice of words, and sentence construction. Choose the answer that produces the most effective sentence; this answer should be clear and exact, without awkwardness, ambiguity, redundancy or grammatical error.
No giant squid has ever survived in captivity because these giant animals of the deeps require extremely high water pressure for the purpose of maintaining its internal osmotic balance.
A、B、D三项中存在主谓不一致问题；E项“maintenance”指代不明确，故本题选C项。
Four Dynacorp Optimall Omniprocessors were shipped in the fourth quarter, and it brought to13 the number of these ultra-high-capacity processors shipped during the year.
根据句意可知，后面的内容是定语，故E项是正确的。
Advanced market research forthe MegaTek Corporation predicts that launching a MegaTek Superstore in a given city, would only succeed should the density of repeat customers have been greater than 200 per square mile.
根据“the MegaTek Corporation predicts”可知从句时态应为将来时，故A、D错误；剩余选项相比，C项的表达更加符合习惯，故本题选C项。
Providing adequate public health-care facilities is a crucial task in a county like Travis, where more than 60 percent of household incomes are below the poverty line.
非限制性定语从句修饰travis，故A项是正确的。