12含有能开得尽方的因数4，因此12不是最简二次根式．
I had wanted to clean out the basement ______, but unfortunately he came back before I did it. [ ]
A. in a hurry
B. in his absence
C. in his memory
D. in his company
仰卧位时，前腹壁与胸骨下端到耻骨联合的连线大致在同一水平面上，称为（）
A.腹部平坦
B.腹部饱满
C.腹部膨隆
D.腹部低平
E.腹部凹陷
