U1. ultimate-U2. unexpected

ultimate

构词：ult（= out 外面）＋-imate（匹配）

相当于外面 adj. 最终的, 极致的。

相关：ultraviolet, utmost; estimate, legitimate, classmate

搭配：ultimate target / decision / responsibility / triumph / outcome / truths / source / test / challenge / luxury / abuse / sin 

近义：utmost, extreme, supreme; last, final, eventual, terminal

unexpected

构词：un（否定）＋expect（期望）＋-ed（被动 adj.）

未被期望 adj. 想不到的, 意外的

相关：aspect, circumspect,  inspect, prospect, respect, suspect

搭配：unexpected visitor / result / appearance / question / death / change / setback, is totally / entirely unexpected 

近义：unforeseen, surprising, unpredictable, accident, abrupt, sudden, chance

考点：转折关系