The death of Osama bin Laden, the mastermind of 9/11 terrorist attacks, may act as a _______ for retaliation from al-Qaida. Terrorism experts warned that Osama’s followers were likely to take revenge over his death and launch retaliatory attacks on the U.S.
(A) catalyst
(B) casualty
(C) circumference
(D) commemoration

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統計： A(129), B(9), C(13), D(24), E(0) #199922

Lu Pink

B2 · 2012/04/24

#324022

catalyst 【化】催化劑

Amy Lin

B1 · 2012/04/14

#315165

circumference 圓周; 周長

Viva Lin

B3 · 2013/07/08

#687783

casualty傷亡人數

Viva Lin

B4 · 2013/07/08

#687788

commemoration（n.)紀念儀式

...the 50th Anniversary Commemoration of the Warsaw Ghetto Uprising.
华沙犹太区起义50周年纪念
...a service of commemoration.
纪念仪式
...a march in commemoration of Malcolm X.
纪念马尔科姆·艾克斯的游行