Q: Answer the question

A disorder is associated with certain flaws in the human respiratory system. Which is most likely a typical symptom of this disorder?
OPTIONS:
- poor vision
- difficulty breathing
- reduced muscle mass
- increased saliva production

A: difficulty breathing


Q: Answer the question

Water is often put through a treatment system before it is used in homes as drinking water. Which is the most likely reason water is treated before people drink it?
OPTIONS:
- to remove harmful substances
- to add color
- to increase its supply
- to decrease its temperature

A: to remove harmful substances


Q: Answer the question

The following statements are from an article in a fitness magazine. Which of these is an opinion?
OPTIONS:
- Exercise increases muscle mass.
- Regular exercise reduces resting heart rate.
- People should exercise because it makes them feel better.
- Those who exercise regularly can increase their life span.

A:
People should exercise because it makes them feel better.