Unit 4（）Text B. VocabularyReplace the underlined words in the following sentence with one of these words and change the form where necessary. (intimacy, distribute, predispose, abrasion, toxic, entrench, alteration, prevalence, fibrous, deliberately)21. S

Unit 4（）Text B. VocabularyReplace the underlined words in the following sentence with one of these words and change the form where necessary. (intimacy, distribute, predispose, abrasion, toxic, entrench, alteration, prevalence, fibrous, deliberately)21. Such rubbing damage forms when people use their teeth for repeated, forceful stretching and softening of animal tendon or plant material.
正确答案：abrasion