A:don't
B:does
C:doesn't
This book is a little above my head, because there are too many new words in it.
She was so excited that her eyes ____ ____.
如图,有一景区的平面图是一个半圆形,其中O为圆心,直径AB的长为2km,C,D两点在半圆弧上,且BC=CD,设∠COB=θ;
(1)当θ=π12时,求四边形ABCD的面积.
(2)若要在景区内铺设一条由线段AB,BC,CD和DA组成的观光道路,则当θ为何值时,观光道路的总长l最长,并求出l的最大值.