多选题 Many important inventions are the result of ______; for example, Chinese alchemists accidentally discovered gunpowder while trying to create ______ that would make their emperor immortal.

A、 perseverance
B、 expedience
C、 serendipity
D、 a bane
E、 an elixir
F、 a toxin

【正确答案】 C、E

【答案解析】[解析] ● 分号说明前后同义重复；that引导定语从句，前后同义重复。
● 第一空与accidentally(偶然地)同义重复。perseverance百折不挠，expedience得当，serendipity意外。答案选C。
● 第二空与would make their emperor immortal(让他们的皇帝长生不老)同义重复。bane毒药，elixir长生药，toxin毒药。答案选E。