单选题 Clark felt that his ______ in one of the most dramatic medical experiments of all time was worth the suffering he underwent.
  • A. presentation
  • B. participation
  • C. apprehension
  • D. appreciation
【正确答案】 B
【答案解析】[解析] 四个选项的意思分别是：presentation“展示，发布”；participation“参加，加入”；apprehension“忧虑，恐惧”；appreciation“理解，欣赏”。句意是，克拉克感到，虽然自己遭受磨难，但是参加这一有史以来最伟大的医学试验是值得的。所以正确答案是B选项。