下列各组词语中加点字读音相同的一项是                                                   

A．成见称扬乘人之危惩前毖后

B．达标答谢打躬作揖大轰大嗡

C．顿挫遁迹遁世绝俗成败利钝

D．汩没股肱故弄玄虚顾影自怜

When the（）is large, the ship is stiff; and when it is small, she is tender.

A.GM

B.free surface

C.longitudinal center of gravity

D.transverse center of gravity