Early life insurers in the United States found themselves facing the problem of obtaining reliable information, as they needed to rely on applicants themselves to provide truthful, complete answers to a standard set of questions. <早期美國的保險(xiǎn)公司發(fā)現(xiàn),獲得可靠信息對它們來說是
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Astronomer: Most stars are born in groups of thousands, each star in a group forming from the same parent cloud of gas. Each cloud has a unique, homogeneous chemical composition. Therefore, whenever two stars have the same chemical composition as each oth
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Human-caused disturbances, such as habitat destruction and the introduction of nonnative species, are among the leading causes of plant and animal population declines. Most populations are affected by a combination of adverse human pressures, each of whic
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