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).

Paragraph: When the heart expels more blood with each stroke, the heart has to beat less often in order to maintain the same volume of blood flow.
 Question: Jon was jogging, and quickening his pace. His heart is beating _____. 
 Choices: A)more 
B)less
more

Paragraph: In the thermosphere, temperatures increase as altitude increases.
 Question: If Mona is flying her plane in the thermosphere and she moves to a higher altitude heading, what happens to the temperature? 
 Choices: A)increases 
B)decreases
increases

Paragraph: Increasing air temperature decreases atmospheric pressure.
 Question: The air gets thinner when it is 
 Choices: A)hot 
B)cold
hot