Alternate: happening or following one after the other
Substitute: to use something new or different instead of something else
Exchange: give or receive sth/sb in place of another
3. 【D】certify: formally declare , esp in writing or on a printed document
Classify: arrange systematically in classes or groups
Clarify: become clear or easier to understand
Notify: inform sb ; report sth to sb
4. 【B】非限制性定语从句。选项C和D均构成完整句子,前面需加连词。A 不符合语法,只有B正确。
5. 【C】insensitive: not able to feel sth
Allergic: having an allergy(过敏)
Sensible: having or showing good sense; reasonable
Infected: a part of your body or a wound that is infected has harmful bacteria in it which prevent it from healing.
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