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Answer:
D: communities that use the latest digital technology, particularly computer systems that respond to input from networks of sensors, to deliver city services efficiently and improve urban life
Explanation:
This links back to the main idea of the passage and the writer wants a sentence in order "to help clarify the central concept of the essay."
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C. & D.
He killed himself because he could no longer tolerate the horrors of war, his own psychological abilities to deal with the horrors had turned on himself, so that he took his own life. And unlike a normal situation in life, the war had made it so that life and meaning were no longer relevant. They did not recognize the value of his life dead or alive, demonstrating another mental loss in the psychology of warfare.