8. Advertisement: When your car's engine is running at its normal operating temperature, any major brand of motor oil will protect it about as well as Tuff does. When the engine is cold, it is a different story: Tuff motor oil flows better at lower temperatures than its major competitors do. So, if you want your car's engine to have maximum protection, you should use Tuff.
Which of the following, if true, most strengthens the argument in the advertisement?

A、 Tuff motor oil provides above-average protection for engines that happen to overheat.
B、 Tuff motor oil is periodically supplied free of charge to automobile manufacturers to use in factory-new cars.
C、 Tuff motor oil's share of the engine oil market peaked three years ago.
D、 Tuft motor oil, like any motor oil, is thicker and flows less freely at cold temperatures than at hot temperatures.
E、 Tuff motor oil is manufactured at only one refinery and shipped from there to all markets.

【正确答案】 A

【答案解析】 Argument Evaluation
Situation An advertisement argues that since Tuff motor oil flows better than its major competitors at low
temperatures and works about as well as they do at normal temperatures, it provides maximum
protection for car engines.
Reasoning What additional evidence would suggest that Tuff motor oil provides the best available protection for
car engines? The argument requires the assumptions that no type of motor oil other than the
"major brands" provides superior protection, that flowing better at lower temperatures ensures
superior protection at those temperatures, and that Tuff protects car engines at least as well as its
competitors do at above-normal temperatures. Any evidence supporting any of these assumptions
would strengthen the argument.
A Correct. If Tuff provides above-average protection when engines overheat, in addition to the solid protection it provides at normal and low temperatures, it may well provide the best available protection overall.
B The company that makes Tuff might give automobile manufacturers free motor oil as a promotional gimmick even if Tuff is an inferior product.
C Tuff's sales might have declined over the past three years because consumers have realized that Tuff is an inferior product.
D The similar responses of Tuff and other motor oils to temperature changes do not suggest that Tuff provides better protection overall than those other motor oils do.
E Even if Tuff is manufactured at only one refinery, it may still be an inferior product.
The correct answer is A.