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整合素家族得名是因为( )
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From "The Story of Dan and Steve"Steve's brother, Dan, is a risk taker. Two years ago, he hiked through the Andes Mountains in Chile with only a backpack and a knife. Four years ago, he learned to scuba dive while on an adventure cruise in Alaska. Recently, he took up skydiving.Why did the writer say that Dan tried hiking, backpacking, scuba diving, and skydiving?
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