After his journey from abroad, Richard Jones returned home, ______ .
A:energetic
B:confirmed
C:exhausted
D:independent
老师是我们学习的( )
有关氧气和氢气的实验室制法,下列说法正确的是 ( )
若如图程序框图的输出结果为120,则判断框中应填写的判断条件为( )