题干
—What's your mother's job?
—
A：She is reading.
B：She is 40 years old.
C：She wants to be a teacher.
D：She is a manager.
答案(点此获取答案解析）
D
—What's your mother's job?
—
A：She is reading.
B：She is 40 years old.
C：She wants to be a teacher.
D：She is a manager.
，宽为 
，圆的半径为 
，求阴影部分的面积(π取3.14). 
