Q19 recently physicians have determined that stomach

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Q19: Recently physicians have determined that stomach ulcers are not caused by stress, alcohol, or rich foods, but a bacterium that dwells in the mucous lining of the stomach. A. not caused by stress, alcohol, or rich foods, but B. not caused by stress, alcohol, or rich foods, but are by C. caused not by stress, alcohol, or rich foods, but by D. caused not by stress, alcohol, and rich foods, but E. caused not by stress, alcohol, and rich foods, but are by Answer: ------------------------------------------------------------------------------------------------------------ Q20: Rivaling the pyramids of Egypt or even the ancient cities of the Maya as an achievement, the army of terra-cotta warriors created to protect Qin Shi Huang, China’s first emperor, in his afterlife is more than 2,000 years old and took 700,000 artisans more than 36 years to complete them . 24
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------------------------------------------------------------------------------------------------------------ Q21: That twenty-one ceramic dog figurines were discovered during the excavating of a 1,000- year-old Hohokam village in Tempe, Arizona, has nearly doubled the number of these artifacts known to exist. ------------------------------------------------------------------------------------------------------------ Q22: City Official: At City Hospital, uninsured patients tend to have shorter stays and fewer procedures performed than do insured patients, even though insured patients, on average, have slightly less serious medical problems at the time of admission to the hospital than uninsured patients have. Critics of the hospital have concluded that the uninsured patients are not receiving proper medical care. However, this conclusion is almost certainly false. Careful investigation has recently shown two things: insured patients have much longer stays in the hospital than necessary, and they tend to have more procedures performed than are medically necessary. In the city official’s argument, the two boldface portions play which of the following roles? ------------------------------------------------------------------------------------------------------------
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