The room was dark, so she asked me to _________ the lights.
A:turn up
B:turn down
C:turn off
D:turn on
嗓子“发炎”的病人,血常规化验单中,数目明显增多的血细胞是( )
如图,点P在直线AB外,在过P点的四条线段中表示点P到直线AB距离的是线段( )