question:Ferber's syndrome, a viral disease that frequently affects cattle, is transmitted to these animals through infected feed. Even though chickens commercially raised for meat are often fed the type of feed identified as the source of infection in cattle, Ferber's syndrome is only rarely observed in chickens. This fact, however, does not indicate that most chickens are immune to the virus that causes Ferber's syndrome, since__. Which of the following most logically completes the argument? A: resistance to some infectious organisms such as the virus that causes Ferber's syndrome can be acquired by exposure to a closely related infectious organism B: chickens and cattle take more than a year to show symptoms of Ferber's syndrome, and chickens commercially raised for meat, unlike cattle, are generally brought to market during the first year of life C: the type of feed liable to be infected with the virus that causes Ferber's syndrome generally constitutes a larger proportion of the diet of commercially raised chickens than of commercially raised cattle D: Ferber's syndrome has been found in animals that have not been fed the type of feed liable to be contaminated with the virus that can cause the disease Choose A, B, C or D as your solution.

question:Demand levels for some categories of products are closely interdependent. When one type of a product can serve as a complement for another product, the levels of demand for these goods are positively related. An increase in the demand for one product usually increases the demand for its complementary product. Similarly, a decrease in the demand for one good causes a decrease in the demand for its complementary product. Which of the following statements provides an example of the relationship between product demands described above? A: A decrease in the demand for CD players results in a decrease in the demand for CD's. B: An increase in the demand for butter results in an increase in the demand for margarine. C: A decrease in the demand for cable television results in an increase in the demand for satellite antennas. D: An increase in the demand for toothpaste results in an increase in the demand for cellular phones. Choose A, B, C or D as your solution.

question:Since it has become known that <b> several of a bank' s top executives have been buying shares in their own bank </b>, the bank' s depositors, who had been worried by rumors that the bank faced impending financial collapse, have been greatly relieved. They reason that, since top executives evidently have faith in the bank's financial soundness, those worrisome rumors must be false. Such reasoning might well be overoptimistic, however, since <b> corporate executives have been known to buy shares in their own company in a calculated attempt to dispel negative rumors about the company' s health </b>. In the argument given, the two boldfaced portions play which of the following roles? A: The first provides evidence in support of the main conclusion of the argument; the second states that conclusion. B: The first describes the circumstance that the argument as a whole seeks to explain; the second provides evidence in support of the explanation that the argument seeks to establish. C: The first describes the circumstance that the argument as a whole seeks to explain; the second gives the explanation that the argument seeks to establish. D: The first describes evidence that has been taken as supporting a conclusion; the second gives a reason for questioning that support. Choose A, B, C or D as your solution.

question:Rail Executive: Five years ago we discontinued train service between Lamberton and its suburbs because low ridership caused total fares collected to be substantially lower than the cost of operating the service. It is true that recent population growth in the suburban communities suggests increased potential ridership. Nevertheless, since most of the newer residents own automobiles, restoring the train service this year would still result in serious deficits Which of the following , if true casts the most serious doubt on the rail executive's argument? A: Recently there have been sharp increases in parking fees in Lamberton and in highway tolls on major commuter routes B: A survey conducted last year showed that few people living in Lamberton or its suburbs support increased public funding for mass transportation C: Most of the new residents of Lamberton's suburbs do not need to travel into Lamberton regularly for shopping or recreation D: If train service were restored this year with increased hours of service, there would not be an increase in total ridership Choose A, B, C or D as your solution.