界线由骶岬、弓状线、耻骨梳及耻骨联合上缘围成的（）。
参考答案：环行线
凡是煤都能单独炼焦。
—Would you like to play computer games with me?
—Sorry, I have ________ playing them. [ ]
A. made up
B. given up
C. picked up
D, got up
