题目内容
This book poses an interesting _____, namely that geographic and other natural factors, rather than cultural differences, have led to vastly different outcomes for societies.
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Whether you’re building a novel product, creating a new educational mechanism, or initiating a research program, you simply don’t have quantitative ____ to share.
Most of my _____ immigrated during the Irish Potato Famine in the first half of the 1800s.
Unfortunately, the authors fail to elaborate on the method they used. ( )
In their first study, they forecast an increase in the elderly population of 12.6 million between 2013 and 2023. ( )
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