Flu is a very ______ infectious disease. Fever, headaches, coughing and fatigue are some of its ______ symptoms.A.normal; monB.usual; ordinaryC.mon; usualD.ordinary; normal
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C解析考查形容词辨析：normal;正常的， mon共同的，常见的， usual; 平常的，ordinary普通的，句意是：流感是很常见的传染病，发烧，头疼，咳嗽，疲劳是它平常的症状。选C。