题目内容
从各医院收集病例组成队列进行预后研究，最有可能的偏倚是：（）
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大样本分组资料计算生存率用：（）
Unfortunately, we now have plenty of evide____ that many children do notdo half as well on tests as they actually could if they tried.
A foreigner’s first ____ of the US is likely to be that everyone is in a rush—often under pressure.
The small country was destroyed by ten years of ____ fighting.
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