【每日逻辑练习第二季【2-2】

FB小贝

【1】Background: Modern… to the runway.
Premise: Recently, one plane with
low-power circuitry veered off course during landing,
its dials dimming, when a passenger turned on a
laptop computer.
Conclusion:  Clearly, modern aircraft navigation
systems are being put at risk by the electronic
devices that passengers carry on board, such as
cassette players and laptop computers.
Least Strengthen(weaken): not the problem of electronic devices
A. Strengthen
B. Strengthen
C. Strengthen
D. Strengthen
E. Irrelevant ,correct
【2】Background: the continent was blanketed by a blue haze resulting from the eruption of the Laki Volcano in the European republic of Iceland in the summer of 1984.
Premise: An unusually severe winter occurred in Europe
Conclusion: major eruptions cause the atmosphere to become cooler than it would be otherwise.
Weaken: temperature rise after eruptions/severe winter is caused by other factors
A. Irrelevant
B. Irrelevant
C. correct
D. strengthen
E. Irrelevant—sea surface is not the same as air temperature
【3】Background: Most household appliances use electricity only when in use.  Many microwave ovens, however, have built-in clocks and so use some electricity even when they are not in use.  
Premise: The clocks each consume about 45 kilowatt-hours per year.
Conclusion: Therefore, households whose microwave oven has no built-in clock use 45 kilowatt-hours per year less, on average, than do comparable households whose microwave oven is otherwise similar but has a built-in clock.
Assumption: the two kinds of mo consume the same electricity except for the clock
A. Irrelevant
B. Irrelevant
C. Irrelevant
D. correct  no more plugged in clocks
E. Irrelevant
【4】Background: Some airlines allegedly reduce fares on certain routes to a level at which they lose money, in order to drive competitors off those routes.
Premise:  Once an airline successfully implements this method, any attempt to recoup the earlier losses by charging high fares on that route for an extended period would only provide competitors with a better opportunity to undercut the airline's fares.
Conclusion:  this method of eliminating competition cannot be profitable in the long run.  
Weaken: successfully implements will not cause losses
A. Irrelevant
B. Irrelevant
C. correct
D. Irrelevant
E. Strengthen
【5】Background: When an airplane is taken out of service for maintenance, it is often repainted as well, and during the repainting no other maintenance work can be done on the plane.  
Premise: The film takes just as long to apply as paint does, but many other maintenance tasks can be carried out at the same time.
Conclusion: reduce maintenance time
Strengthen: the film lasts at least as long as the paint
A. Irrelevant
B. Strengthen , correct
C. weaken
D. irrelevant
E. irrelevant