A:①③
B:①④
C:②③
D:②④
It is ______for him to get to school on time, because it is raining ______.
中国与俄罗斯之间的贸易互补性强,目前中国每年需从俄罗斯进口1500多万吨石油,适宜采用的运输方式是
( )