If it does not work, you have misread the problem or one of the other choices. For ruling out bad choices, it helps to know that they fall into definite categories. Contains a factual error. Smog production is detrimental to the environment. Bicycles generate less friction because they have only two tires.
Bicycles consume less energy than cars.
The exhaust released by muscle contains only water and carbon dioxide. The best answer is d . True but irrelevant. The preceding examples are easy because they deal with familiar ideas that belong to strong networks. If two choices look equally good, your network is too fragmented.