instruction:
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).
question:
Paragraph: A sunscreen with a higher SPF value protects the skin longer.
 Question: John was analyzing some of the results from his sunscreen study. He found that a lower SPF protects the skin 
 Choices: A)Shorter 
B)Longer
answer:
Shorter


question:
Paragraph: Water density increases as salinity and pressure increase, or as temperature decreases.
 Question: By removing a pound of salt from a bucket of fresh water, could you cause the density of the water to 
 Choices: A)increase 
B)decrease?
answer:
decrease?


question:
Paragraph: Warm air is less dense than cool air, so it rises higher in the troposphere.
 Question: Cold air is able to fill less space than warm air because it is 
 Choices: A)more dense 
B)less dense
answer:
more dense