ignorance

我对她对世界历史的完全无知感到震惊。

I was shocked by her total ___ignorance of world history.

关于疾病如何传播，普遍存在无知。

There is widespread ___ignorance about how disease spreads.

生活在对现代技术起源的无知中，是对发明者的不尊重。

Living in ___ignorance about the origins of modern technology is a disservice to those who invented it.