【C6】A．importantB．availableC．identicalD．necessary

A． essentialB． availableC． reliableD． responsible

A．importantB．reliableC．sadD．acceptable

_____________ 查看材料A.familiarB.similarC.identicalD.s

【C4】A．mutualB．matureC．identicalD．respective

【C12】A．positiveB．uniqueC．identicalD．favorable

【C2】A．importantB．inadequateC．intricateD．impractical