Boys, don’t lose____ in playing Angry Birds. It is bad for your eyes to play computer games for a long time.

A．himself

B．yourself

C．themselves

D．yourselves

中央型肺癌的特点应除外()

A．位于肺门部

B．由段以上支气管发生

C．多属腺癌

D．巨大癌块环绕支气管

E．较易被纤支镜检查发现