如图,四边形ABCD是⊙O的内接四边形,⊙O的半径为2,∠B=135°,则 的长( )
A:2π
B:π
C:π2
D:π3
折线统计图可以清楚地表示出各部分同总数之间的关系.
函数fx=2x-1+log2x的零点所在区间是( )
I hear there is _____panda in the zoo, and I want to take _______ bus to see it.