对于一个健康的成年人，一次失血200-300ml（　　）

A．不会影响健康

B．会出现头晕、心跳等症状

C．会出现眼前发黑、出冷汗等现象

D．会发生生命危险

—What do you like doing in your free time?

—I like playing        cards and        Chinese chess.

A．a; a

B．/; a

C．/; /

D．the; the