髌骨横断骨折的损伤机制是（）

A.直接暴力

B.间接传达暴力

C.肌肉强烈收缩

D.扭转暴力

E.直接＋间接暴力

Try the new cleaner．Just a few minutes every day—that’s all it takes—______you could have shining floors and furniture．

A．and

B．but

C．or

D．so