已知△ABC中,A:B:C=1:1:4,则a:b:c等于( )
A:1:1:4
B:1:1:2
C:1:1:3
D:2:2:3
如图所示的实验操作中正确的是( )
下图漫画启示我们( )
——Tom, where is your father?
——I'm not sure. He_______ in his office.