6. Despite years of failed trials and relentless criticism, she remained ______, refusing to abandon her research even when funding was withdrawn.
(A) gregarious
(B) tenacious
(C) volatile
(D) lethargic

選項解析

(A) gregarious

合群的；愛社交的

• a gregarious person enjoys company
• 與科研堅持無關。❌

(B) tenacious

堅韌的；不屈不撓的

• She is tenacious in pursuing her goals.
• perfectly fits persistence under pressure ✔

(C) volatile

易變的；不穩定的；易怒的

• volatile market / volatile emotions
• 不符合語意。❌

(D) lethargic

無精打采的；懶散的

• He felt lethargic after the illness.
• 與「堅持研究」相反。❌

字彙補充

• tenacious = stubbornly persistent（堅韌不放棄）
• 常見搭配：
  • tenacious effort（堅持不懈的努力）
  • tenacious pursuit（不放棄的追求）
  • tenacious grip（緊抓不放）

例如：

• Despite setbacks, she remained tenacious.
• The team showed a tenacious spirit throughout the competition.

因此正確答案是 (B) tenacious。