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【单选题】
Stress and energy levels are related because _____.
A.
exercise helps to get rid of stress
B.
some people suffer from adrenal fatigue
C.
too much stress has negative physical effects on the body
D.
cortisol is not produced sufficiently when the body is under stress
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【单选题】A diet that will help athletic performance includes _____.
A.
very little fat
B.
more protein than carbohydrates
C.
the right balance of proteins and carbohydrates
【单选题】According to Dr. Rimes, when athletes live at higher altitudes _____.
A.
they can tolerate colder temperatures
B.
their lungs become more efficient at using oxygen
C.
they can't adjust easily to lower altitudes
【单选题】Training at high temperatures can help athletes improve by _____.
A.
20 percent
B.
12 percent
C.
7 percent
【单选题】Training in hot conditions helps because it _____.
A.
improves blood flow
B.
improves lung efficiency
C.
reduces sweating
【单选题】Attaching significance to an object can _____.
A.
decrease performance
B.
improve performance
C.
cause stress
【单选题】Apples and onions are good for athletes because they contain _____.
A.
quercetin
B.
Vitamin D
C.
protein