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投资组合的总体收益全部来自于市场系统性风险相匹配的市场收益（即来自β的收益）。
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人力资本理论基本出发点是（）
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行政单位资产负债表建立的理论依据是（）。
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按信息产生的先后或加工深度可将信息分为（）；（）；（）
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弥漫性轴索损伤多见于下列哪种类型的颅脑损伤（）
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我们的立国之本是什么？
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Choose the best words into the sentences. Sudan is the only male northern white rhino (犀牛) left in the world. That (mean) Sudan, 42, is the last hope for avoiding extinction. (protect) him, officials have placed him under 24-hour armed guard at the OI Pejeta Conservancy in central Kenya. Sudan lives there two female northern white rhinos, Fatu and Najin. Northern white rhinos, can weigh up to 5,000 pounds, were once plentiful across northern and central Africa. (hunter) have killed thousands of rhinos because of high demand for the animals，horns (角). Rhino horns, believed to have medical effects, are used in (tradition) Asian medicines. More than 1,000 rhinos (kill) in 2014 in South Africa alone and fifty-four rhinos in Kenya, which has a much (small) population. Sudan, Fatu, and Najin have had their horns (remove) so that they will not be hunted. People hope Sudan and one of the females will be able to have a baby. Sudan is very old, but scientists will not give up hope.
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教学目标是（）学生通过教学活动获得的（）。
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主通风机巡回检查的时间一般为每2小时一次。
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最常见的恶性骨肿瘤是（）