（1）如图，三块相同砖被压在两竖直方向的木板之间，设每块砖的重力为G，则A与左板间的摩擦力大小为______，A与B之间的摩擦力大小为______．

（2）用两根能承受的最大拉力相等、长度不等的细线AO、BO，如图所示悬挂一个中空铁球，细线的长度AO＞BO，当在球内不断注入铁砂直到线断为止，则______

A．AO先被拉断．             B．BO先被拉断．

C．AO、BO同时被拉断．       D．条件不足，无法判断．

Which of the following statements is NOT true of comedy according to the passage

A．Present comedy is funnier than the past.

B．People’s conception on comedy remains unchanged for decades.

C．Contemporary comedy tends to be superficial.

D．Old comedy was considered thought-provoking.