spends a few hours in lab every Wednesday. He ______
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简要病史男性，15岁。主诉：左膝关节肿痛7天，黑粪3天。
canoe to America during the 16th and the 17th century ______
go back. Of course, he arrived very late at the office. ______
有的儿童绘画能力突出，有的儿童动手操作能力较强，还有的儿童能歌善舞，对音乐、韵律特别敏感……
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