[stationary crests and tro...] The peaks of a mountain range, acting like rocks in a streambed, produce ripples in the air flowing

For Competitive Exams

The peaks of a mountain range, acting like rocks in a streambed, produce ripples in the air flowing over them; the resulting flow pattern, with crests and troughs that remain stationary although the air that forms them is moving rapidly, are known as "standing waves."

crests and troughs that remain stationary although the air that forms them is moving rapidly, are

crests and troughs that remain stationary although they are formed by rapidly moving air, are

crests and troughs that remain stationary although the air that forms them is moving rapidly, is

stationary crests and troughs although the air that forms them is moving rapidly, are

stationary crests and troughs although they are formed by rapidly moving air, is

Explanation:
The main challenge in this sentence is to observe the agreement of subject and verb (the resulting flow pattern... is known...) despite the distraction of a complex intervening structure containing several plural elements (with crests and troughs...). Choices A, B, and D can, therefore, be eliminated because they use an incorrect plural verb form, are. Choice E uses the correct verb form, is, but it incorrectly introduces a dependent adverbial although clause into a prepositional phrase (with crests ...). Choice D also makes this error. Such dependent clauses can only occur in the predicates of full clauses. C, the best choice, uses the correct verb form, is, and correctly puts the although clause inside the predicate of the relative clause (that... rapidly).

Additional Questions

Like Auden. the language of James Merrill is chatty, arch, and conversational--given to complex syntactic flights as well as to prosaic free-verse strolls.	Answer
The Senate approved immigration legislation that would grant permanent residency to millions of aliens currently residing here and if employers hired illegal aliens they would be penalized.	Answer
The publishers, unwilling to shoulder the entire risk, insisted that the author should pay half the cost of the initial print run of his controversial new book.	Answer
Scientists have recently discovered what could be the largest and oldest living organism on Earth, a giant fungus that is an interwoven filigree of mushrooms and rootlike tentacles spawned by a single fertilized spore some 10,000 years ago and extending for more than 30 acres in the soil of a Michigan forest.	Answer
The period when the great painted caves at Lascaux and Altamira were occupied by Upper Paleolithic people has been established by carbon-14 dating, but what is much more difficult to determine are the reason for their decoration, the use to which primitive people put the caves, and the meaning of the magnificently depicted animals.	Answer
The Baldrick Manufacturing Company has for several years followed a policy aimed at decreasing operating costs and improving the efficiency of its distribution system.	Answer
Parliament did not accord full refugee benefits to twelve of the recent immigrants because it believed that to do it rewards them for entering the country illegally.	Answer
Many policy experts say that shifting a portion of health-benefit costs back to the workers helps to control the employer s costs, but also helps to limit medical spending by making patients more careful consumers.	Answer
The Federalist papers, a strong defense of the United States Constitution and important as a body of work in political science as well represents the handiwork of three different authors.	Answer
More and more holidaymakers are choosing to fly to remote islands in search of the perfect beach; seeking sand, sun and palm trees, rather than centers of entertainment.	Answer

Share with Friends