D项inviting意为邀请；例句：She showed me her gratitude by inviting me to dinner.她邀请我吃晚饭以表示感谢。
很明显B项正确。
4.A
【解析】题意：他断言核能是一种安全而又无污染的能源。划线词词义是“主张，断言”。
A项maintained意为主张，强调；例句：He maintains that there are no short cuts to effective management.他断言，有效的管理没有捷径可走。
B项recommended意为推荐；例句：I recommended(you)meeting him first.我建议(你)先见见他。
C项considered意为考虑；例句：Please take time to consider the problem.请仔细考虑一下这个问题。
D项acknowledged意为承认。例句：He is unwilling to acknowledge defeat.他不愿认输。很明显A项正确。
5.A
【解析】题意：入侵的决定引起了强烈的抗议。划线词词义是“引起，激发”。
A项caused意为引起，使发生；例句：Many diseases are caused by bacteria.许多疾病是由细菌引起的。
B项ignored意为忽视；例句：If there’s one meal that is ignored nowadays，it is breakfast.如果有一顿饭被忽视的话，那就是早餐。
C项organized意为组织；例句：The meeting was badly organized.会议组织得很糟。
D项received意为收到。例句：He must start to question received opinion.他必须开始质疑自己已经接受的观点。
很明显A项正确。
6.B
【解析】题意：在营救两名儿童之后，这名年轻男子被称颂为英雄。划线词词义是“向…欢呼，致贺”。
A项reported意为报道；例句：It is reported that 20 people were killed in the accident.这次事故据报道有20人死亡。
B项praised意为称赞，表扬。例句：The teacher praised her for her courage.老师赞扬了她的勇气。