单选题 Within the foreseeable future there may be a major ______ of species, involving from one-third to two-thirds of all the species now in existence.
A. exhaustion B. exhibition C. extension D. extinction

【正确答案】 D
【答案解析】在不久的将来可能会有物种的灭绝，包括现存的1/3～2/3的物种都会濒临灭绝。这道题考查学生辨别形近词的能力，这四个词长得很像，但意思却大相径庭：exhaustion耗尽，exhibition展览，extension拓展，extinction灭绝。