1. Two groups of laboratory mice were injected with cancerous cells. One group’s cages were rotated in a disorienting manner. Two-thirds of these mice developed cancers. One-tenth of the mice in stationary cages developed cancers. The researchers concluded that stress enhances the development of cancer in laboratory mice.
The researchers’ conclusion logically depends on which of the following assumptions?
(A) Rotating the cages in disorienting manner produced stress in the mice in those cages.
(B) The injections given to the two groups of mice were not of equal strength.
(C) Injecting the mice with cancerous cells caused stress in the mice.
(D) Even without the injections the mice in the rotated cages would have developed cancers.(A)
(E) Even the rotation of cages in a manner that is not disorienting is likely to produce stress in mice in those cages.
2. In 1846 about 80 percent of the towns in New York State banned the sale of alcoholic beverages. A recent article about the bans concludes that mid-nineteenth-century supporters of the temperance movement were not residents of remote rural areas, as has often been asserted; rather, they were concentrated in centers of economic opportunity.
Which of the following, if true, best supports the conclusion reached in the article?
(A) After 1846 the temperance movement grew rapidly and it flourished until the turn of the century.
(B) Support for the ban on alcohol was strongest in New York towns where the economy was based on new, growing industries.
(C) Many young New York State farmers supported the ban on alcohol.
(D) The most adamant opponents of the ban included several affluent factory and mill owners.(B)
(E) In New York City, which was a commercial center in 1846, the sale of alcoholic beverages was not banned...…………
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