Explanation:
The Americans and the Russians
If the root hydro- means "water", then the word that means "an electrical instrument used to monitor underwater sounds" is called a hydrophone. A hydrophone is a kind of microphone that is specifically used to detect and record sound waves underwater.
D. because it's the purpose of a paper and what you think of a certain topic
Macaroni and cheese are the best comfort food.
The statement that best summarize the passage is C. because it shows the climax and it gives enough information for the reader to have a better understanding of the passage.
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