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).
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Question: Paragraph: By using multiple stages, empty fuel containers could drop away. This reduced the mass of the rocket so that it could fly higher.
 Question: Ray was traveling in rocket leaving orbit. He keeps the empty fuel containers on board so the ship can fly 
 Choices: A)higher 
B)lower

Answer: lower


Question: Paragraph: Faster-moving water has more energy.
 Question: Ollie pours his water quickly while Fay pours her water slowly. Whose water contains more energy? 
 Choices: A)Ollie 
B)Fay

Answer: Ollie


Question: Paragraph: For a given medium, sound waves travel more slowly at lower temperatures.
 Question: When it is very cold what happens to the speed of items? 
 Choices: A)speed up 
B)slow down

Answer:
slow down