急性腰扭伤的不常见原因是（）。

A.动作失调

B.姿势不良

C.搬物过重

D.重心失衡

E.准备不足

Define a proverb and illustrate how proverbs are related to culture in different cultures, by referring to the following groups of examples.(1) God help those who help themselves. 平时不烧香，临时抱佛脚。(2) Rats desert a sinking ship. 树倒猢狲散。