Exercise R31

(A) Scree, which abounds in the Rocky Mountains, has its origins in the ice ages.

(B) The Rocky Mountains have a lot of scree, whose formation dates back to the ice ages.

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(A) The drum and flute music once heard in the streets has been replaced by noisy radios and cassette players.

(B) Radios and cassette players are now heard in the streets, which once were filled by the sounds of drum and flute music.

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(A) Many reef organisms avoid dead-end caves, which lack the steady currents necessary for bringing a continuous food supply.

(B) Dead-end caves don't have currents which bring in food supplies, so many reef organisms don't go there.

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(A) Instead of being overwhelmed by the hard life in Montana, Evelyn Cameron reveled in it.

(B) Evelyn Cameron revealed how difficult life was in Montana.

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(A) Two theaters in Stratford-upon-Avon and two in London are regularly used by the Royal Shakespeare Company.

(B) The Royal Shakespeare Company regularly uses four theaters - two in Stratford-upon-Avon and two in London.

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(A) Police reconstruct scenes because people seem to recall things best when they are in the same physical situation.

(B) When people are in the same physical situation, they seem to remember

better scenes than the ones police have reconstructed.

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(A) Despite the cold Alaskan temperatures, which freeze perspiration and breath in a man's beard, cabin fever forces inhabitants to challenge the

elements.

(B) The Alaskan inhabitants suffer from cabin fever, which causes perspiration and breath to freeze in the men's beards.

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(A) Leather, when improperly handled and exposed to changeable temperatures, cracks easily.

(B) Leather cracks easily when it is handled incorrectly and is exposed to variable temperatures.

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(A) Despite the increasing pollution of their shorelines, oceans have become cleaner in the vast open-sea areas over the past decade.

(B) During the last 10 years, pollution has been increasing along the coasts of the oceans and spreading to the once clean open-sea areas.

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(A) The Hitler diaries, the greatest known publishing fraud in history, were written by a man who copied material from Hitler's speeches and medical reports.

(B) By copying material from Hitler's speeches and medical reports, a man wrote the Hitler diaries, which became known as the greatest publishing fraud in history.

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