A:①②
B:③④
C:①④
D:①③
直线a、b、c是三条平行直线.已知a与b的距离为5cm,b与c的距离为2cm,则a与c的距离为( )
给加线的词选择正确的解释,把它的序号填在括号中。
赫然( )
—Can I call you back at two o'clock this afternoon?
—I'm sorry, but by then I ____(fly) to Beijing. How about five?