Leaching the recovery of copper from the drainage

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Leaching, the recovery of copper from the drainage water of mines, as a method of the extraction of minerals, it was well established as early as the eighteenth century, but until about 25 years ago miners did not realize that bacteria take an active part in the process. A. as a method of the extraction of minerals, it was well established B. as a method of the extraction of minerals well established C. was a well-established method of mineral extraction D. was a well-established method of extracting mineral that was E. had been a method of mineral extraction, well established Answer: ------------------------------------------------------------------------------------------------------------ Q21: Driving the steep road to the mountaintop Inca ruins of Machu Picchu is potentially dangerous and hiking there is difficult. Now the Peruvian government is installing a cable car that will make access much easier, and hence result in a large increase in tourism. However, since the presence of large numbers of tourists tends to accelerate the deterioration of a site, installation of the cable car is certain to result in harm to the ruins. Which of the following, if true, most seriously calls into question the argument? A. The daily number of tourists that are expected to take the cable car to Machu Piccu is smaller than the original resident population of Incas. B. The construction of the cable car terminal at Machu Picchu will require the use of potentially damaging heavy machinery at the site. C. Machu Picchu is already one of the most popular tourist sites in Peru. D. Natural weathering will continue to be a more significant cause of the deterioration of Machu Picchu than tourist traffic. E. The cable car will replace the tour buses whose large wheels and corrosive exhaust at present do significant damage to the site. Answer: ------------------------------------------------------------------------------------------------------------ Q22: Giuseppe Alessi, a world-class chef whose life has been a search for the genuine and the delicious in Florentine cooking, is an accomplished scholar not only unearthing many of his recipes from medieval and Renaissance manuscripts but also a poet and philosopher who draws his inspiration from the idyllic frescoes of Etruscan tombs. A. not only unearthing many of his recipes from medieval and Renaissance manuscripts but also a poet and philosopher who draws B. unearthing many of his recipes both from medieval and Renaissance manuscripts, as well as a poet and a philosopher who draws C. who unearths many of his recipes from medieval and Renaissance manuscripts, as well as a poet and a philosopher who draws D. who unearths many of his recipes from medieval and Renaissance manuscripts, but also a poet and a philosopher drawing 24
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E. who unearths many of his recipes from medieval and Renaissance manuscripts, a poet and philosopher drawing Answer: ------------------------------------------------------------------------------------------------------------ Q23: Environmental organizations want to preserve the land surrounding the Wilgrinn
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Leaching the recovery of copper from the drainage water of...

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