十二指肠溃疡急性穿孔最重要的临床表现（）
A．板状腹
B．腹水
C．阼发性腹痛并肠鸣音亢进
D．腹胀
E．墨菲征阳性
参考答案：A
Mike always says "Hello" to everyone he knows. He is very ______, I think. [ ]
A. helpful
B. funny
C. hard-working
D. polite
