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).

Q: Paragraph: Water becomes more dense when it is colder and when it has more salt.
 Question: What happens to water when it absorbs less salt? 
 Choices: A)lower density 
B)Higher Density

A: lower density
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Q: Paragraph: The rocket goes upwards because the hot gases shoot downwards out of the nozzle. The faster the gases go downwards, the faster the rocket goes upwards.
 Question: Boris was tasked with developing a hypersonic rocket. He built two prototypes that were identical except that they have different gas velocities out of the nozzle. Which rocket was likely the slowest? 
 Choices: A)the rocket with highest gas velocity 
B)the rocket with lowest gas velocity

A: the rocket with lowest gas velocity
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Q: Paragraph: The trade-off when the threads are closer together, is that more turns of the screw or bolt are needed to do the job because the distance over which the input force must be applied is greater.
 Question: If Jim is screwing in two bolts and the first one has threads that are close together while the second one has threads that are far apart, which one must he apply greater force to? 
 Choices: A)first bolt 
B)second bolt

A:
first bolt
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