一道很难的阅读理解的题目

When a large number of positive ions(离子) are present in the air many people experience unpleasant effects such as headaches,exhaustion,irritability, and some particularly sensitibve people suffer the feeling of sickness or even mental disturbance.

题目:
What effect does exceeding positive ionization have on some people?
1.they think they are insane.
2.they feel rather bad-tempered.
3.they bacome violently sick.
4.they are too tired to do anything

答案是 2 为什么 上面irritability不就是坏脾气的意思?
为什么 为什么

小妹我英语很烂
好心人看到能不能说一下

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