题目

Doctor Nathan is said to have been ________to researching into wild animals in Africa for more than ten years. A . absorbed B . devoted C . concentrated D . engaged 答案：B8世纪前期，法兰克王国宫相查理·马特改变了以前无条件赏赐贵族土地的做法，实行有条件的土地分封。这场改革给西欧带来的影响是A．日耳曼民族的大量入侵B．罗马教廷权力至高无上C．森严的封建等级制度形成D．拜占庭帝国被外族所灭