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单项选择题

You are standing on the shore of a lake. You spot a tasty fish swimming some distance below the lake surface. If you want to spear the fish, should you aim the spear （ ）. A. over the apparent position of the fish B. below the apparent position of the fish C. directly at the apparent position of the fish D. Not enough information

问答题

药物过敏反应的严重程度与（  ）无关。