问题
选择题
Flu is a very ______ infectious disease. Fever, headaches, coughing and fatigue are some of its ______ symptoms.
A．normal; common
B．usual; ordinary
C．common; usual
D．ordinary; normal
答案
答案：C
考查形容词辨析：normal;正常的， common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。