单选题 After exploring for more than half a year the ecologist felt a great ______ resulting from the rare species the team had spotted at the foot of the mountain.
【正确答案】 A
【答案解析】thrill兴奋，激动；tremble内心的颤抖，战栗；lust渴望，强烈的愿望；thrift节俭，节约。