A:3
B:4π
C:6π
D:12π
读图,圆圈a、b、c分别代表赤道、回归线、极圈,图中箭头表示地球自转的方向.据此回答下题,关于a、b、c线描述正确的是( )
—What do you think of Alice?
—She is very friendly. She always _______ the other students in her class.
植物进行呼吸作用的主要场所是( )