【有哥在】評論

20. (A) impasse 死路；僵局

【仰】評論

(A) Impasse: an impasse is a situation in which no progress is possible, typically because of disagreement. (B) Rancor: Rancor is feelings of hatred or anger that last a long time. (C) Advent: Advent refers to the arrival or start of something important. (D) Overdrive: Overdrive is a condition of increased activity or speed, especially one that is excessive or intense.The correct answer is D, Overdrive, because it best describes the current situation of scientists and engineers working on optimizing batteries in terms of capability, durability, and sustainability. They are working at an increased activity or speed, especially one that is excessive or intense.