支气管肺癌咯血特点为（）
A.痰中带血
B.铁锈色血痰
C.黏稠暗红色血痰
D.整口鲜血痰
E.脓血痰
参考答案：A
In class the teacher ___ the finance project in simple but vivid language to make it easier for us to understand.
A．undertook
B．clarified
C．approved
D．submitted
化学无处不在，请用所学的化学知识解释，为什么煤炉火越扇越旺，而蜡烛一扇就灭．
