Running, or swift walking, uses the major muscle groups, making it the most efficient form of cardiovascular exercise _______. It also lowers blood pressure and helps diabetics by improving glucose tolerance and reducing insulin resistance.
Answer: A
Correct answer: It has been shown to have a positive effect on blood fats by reducing cholesterol levels
The sentence after the blank begins it also lowers blood pressure, and also requires a benefit to have been named already. Only the keyed option names one; the others describe how running works mechanically.
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