淮南师范学院有几个操场？名称是什么？
参考答案：
3个。风雨操场、煤渣操场、塑胶操场。
I can still recognize Mr. Johnson, who is standing by the door, even though he looks ___different now.
A．mostly
B．slightly
C．unlikely
D．finally
一般用于气动信号传输管线的导管为（）.
A.金属软管
B.电线管
C.水煤气管
D.紫铜管
