You are given a short paragraph, a question and two choices to answer from. Choose the correct answer based on the paragraph and write the answer(not the key).

[EX Q]: Paragraph: More pollutants mean poorer air quality.
 Question: Michael is studying the air quality of various cities. He finds that there are many more pollutants in the air in Mexico City, than there are in the air of Chicago. Therefore, the air quality will be higher in 
 Choices: A)Chicago 
B)Mexico City
[EX A]: Chicago

[EX Q]: Paragraph: The more energy the particles in matter have, the faster and more strongly they vibrate.
 Question: A particle with less energy will vibrate _____ than one with less energy. 
 Choices: A)more 
B)less
[EX A]: less

[EX Q]: Paragraph: When a person exercises regularly, and is fit, the heart undergoes certain long-term adaptations. The heart muscle gets stronger, and expels more blood with each contraction.
 Question: If Ben exercises daily, and Anna exercises only weekly, who has a weaker heart? 
 Choices: A)Ben 
B)Anna
[EX A]:
Anna