80. Advertisement: Clark brand-name parts are made for cars manufactured in this country. They satisfy all of our government automotive tests-the toughest such tests in the world. With foreign-made parts, you never know which might be reliable and which are cheap look-alikes that are poorly constructed and liable to cost you hundreds of dollars in repairs. Therefore, be smart and insist on brand-name parts by Clark for your car.
The argument requires the assumption that
A.Clark parts are available only in this country
B.foreign-made arts are not suitable for cars manufactured in this country
C.no foreign-made parts satisfy our government standards
D.parts that satisfy or government standards are not as poorly constructed as cheap foreign
made parts
E.if parts are made for cars manufactured in our country, they are not poorly constructed
对C,D,E取非后,我觉得都削弱原题，OA是D,如何排除C,E
79.Despite improvements in treatment for asthma, the death rate from this disease has doubled during the past decade from its previous rate. Two possible explanations for this increase have been offered. First, the recording of deaths due to asthma has become more widespread and accurate in the past decade than it had been previously. Second, there has been an increase in urban pollution. However, since the rate of deaths due to asthma has increased dramatically even in cities with long-standing, comprehensive medical records and with little or no urban pollution, one must instead conclude that the cause of increased deaths is the use of bronchial inhalers by asthma sufferers to relieve their symptoms.
Which one of the following is an assumption on which the argument depends?
A.Urban pollution has not doubled in the past decade.
B.Doctors and patients generally ignore the role of allergies in asthma.
C.Bronchial inhalers are unsafe, even when used according to the recommended instructions.
D.the use of bronchial inhalers aggravates other diseases that frequently occur among asthma sufferers and that often lead to fatal outcomes even when the asthma itself does not.
E.increased urban pollution, improved recording of asthma deaths, and the used of asthma deaths, and the use of bronchial inhalers are the only possible explanations of the increased death rate due to asthma.
OA是E，可是对C取非后正好削弱了原文的结论the cause of increased deaths is the use of bronchial inhalers，如何排除C？
O23. On a certain day, nine scheduled flights on Swift Airlines were canceled. Ordinarily, a cancellation is due to mechanical problems with the airplane scheduled for a certain flight. However, since it is unlikely that Swift would have the mechanical problems with more than one or two scheduled flights on a single day, some of the nine cancellations were probably due to something else.
The argument depends on which one of the following assumptions?
A.More than one or two airplanes were scheduled for the nine canceled flights.
B.Swift Airlines has fewer mechanical problems than do other airlines of the same size.
C.Each of the canceled flights would have been longer than the average flight on Swift Airlines.
D.Swift Airlines had never before canceled more than one or two scheduled flights on a single day.
E.All of the airplanes scheduled for the canceled flights are based at the same airport.
这个题我真是百思不得其解了，望高人相助,OA是A。
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