Situations of war are _______. A: planned B: expected C: unchangeable D: changeable

What is the feature of the prominence? A: fixed B: unchangeable C: flexible D: invariable

For so many years, the small town is still ______. A: [A] nonchangeable B: unchangeable C: unchangble

The structure of an idiom is to a large extent ______. A: flexible B: remaining changing C: unchangeable D: none of the above

A _______ is the basic unchangeable part of a word, and it conveys the main lexical meaning of the word. A: prefix B: suffix C: root

Unchangeable risk factors for chronic diseases are A: Adverse psychological factors B: High blood lipids C: Age D: Socio-economic conditions E: Cultural background