a、b、c是三个连续的自然数,且a<b<c,bc﹣ab=50,则a是( )
Jenny and Danny go to China _______ plane.
Danny and Jenny leave in Canada ______ 6:15 in the morning _____ January twenty—eighth。
A train is ____________ than a plane but faster than a bus.
Canada is far _______ China.
When do you leave _____ Beijing?