答案：ACCCA
词汇讲解
1. occupational职业的
For professional footballers, injuries are an occupational hazard.
对于职业足球运动员来说，受伤是职业本身带来的危险。
Explosions, though infrequent, are an occupational hazard for coal-miners.
矿井爆炸虽然不常发生, 但却是煤矿工人职业中的危险.
2. harsh 粗糙的,刺耳的,严厉的
His harsh words caused her much pain.
他说话很刺耳, 她听了很不舒服.
Some modern music sounds harsh and tuneless.
现代音乐中有一些又刺耳又不成调子.
3. descendant 子孙,后代
A member or descendant of a northern Semitic people, claiming descent from Abraham, Isaac, and Jacob; an Israelite; a Jew.
希伯来人，犹太人北方闪米特民族的一员或后裔，自称是亚伯拉罕、以撒克和雅各的后代;古以色列人;犹太人
He is a descendant of Queen Victoria.
他是维多利亚女王的后裔。
4. tenaciously 坚韧不拔地,执着地
Some people tend to tenaciously cling to the misguided concept of racial superiority.
一些人顽强地坚持种族优越性的错误观点。