描述居住面积与建筑总面积之比
A．居住建筑密度B．人口净密度C．人口毛密度D．居住系数E．建筑容积率
参考答案：D
计算：（﹣1）2+[20﹣（﹣2）3]÷（﹣4）
Look at _____ people. _____ they are having _____ football! [ ]
A. the; What a great time; playing
B. /; What great time; playing
C. the; How great time; to play
D. a; How wonderful time; to play
