sickness、illness的区别？？？如果选项同时出现，怎么选？

illness 和 sickness 常可通用，它们主要用于表示生病的时间或因病(disease)导致的不健康状态等。如：

He can’t come because of illness. 他因病不能来。

He died after a long illness. 他死之前病了很久。

She is cheerful in spite of her illness. 她尽管有病，但还是快乐。

He was weak from a long illness. 由于长期生病他身体很虚弱。

Tell me a little about your illness. 给我谈谈你的病。

Chicken pox is a common childhood sickness. 水痘是儿童时期的常见病。

Do you know what his sickness is? 你知道他患什么病吗?

另外，sickness还可表示“呕吐”“恶心”。如：

He’s suffering from sickness and diarrhoea. 他上吐下泻。

He felt a wave of sickness come over him. 他感到一阵恶心。

“sickness”比“illness”程度轻.