（）同时反映物体的同一长度。
A.主视图和俯视图
B.主视图与左视图
C.俯视图与左视图
D.两个视图
参考答案：A
—I have a headache.
—I’m not surprised you ________ in front of the computer for too long.
A．work
B．are working
C．have been working
D．had worked
“精忠报国，三字冤狱，千古白”指的是谁？
