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患者，男性，14岁，8月20日发病，发冷、发热，偶有寒战，伴头痛，呕吐2次，3日后体温达39.1℃，精神不振。查体：嗜睡，腮腺不大，无浅表淋巴结肿大，周身皮肤未见出血点及淤斑，颈强直，浅反射消失，深反射正常。拟诊断为乙脑，为明确诊断，对此患者首选的检查是：
A、血常规
B、尿常规
C、脑脊液检查
D、大便常规

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