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