题目

I didn't get an Ain last week's English examination, so I'm determined (work) harder from nowon. 答案：【1】to work如图，四边形ABCD是一个矩形，⊙C的半径是2cm，CF=4cm，EF=2cm．则图中阴影部分的面积约为（精确到0.1cm2）（ ）A．4.0cm2B．4.1cm2C．4.19cm2D．4.2cm2