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【单选题】
Choose the letter of the sentence that best expresses the implied main idea of the following paragraph. 1. 1 A puddle of dark liquid under a car indicates a leak in the oil or transmission fluid. 2 Another warning sign of car trouble is uneven wear on tire treads. 3 If the outer edge of the tire tread wears out before the center, the tire is under-inflated. 4 The most significant early warning signal, however, is less and less mileage per gallon. 5 Lower fuel economy is caused by a variety of problems ranging from a clogged filter to ignition or carburetor trouble.A.
Several warning signs can indicate car problems.
B.
A puddle of dark liquid under a car is a sign that a car has an oil or transmission fluid leak.
C.
The most significant warning signal of a car problem is getting lower mileage per gallon of gas.
D.
Various problems may cause a car's fuel economy to decrease.
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