五年级一班出席49人,缺席5人,出席人数与总人数的比是______:______.
49:(49+5),
=49:54;
答:出席人数与总人数的比是49:54.
故答案为:49:54.
They like _______ after school.
A.playing the basketball
B.play basketball
C.to play the basketball
D.playing basketball
什么是大气环境容量?