下面两个英语填空,1.The availability of oxygen is an essential--- for

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下面两个英语填空,
1.The availability of oxygen is an essential--- for animal life,while carbon dioxide is
equally------ for plant life.
A.choice … optional B.duplication … selective
C.conversion … exchangeable D.condition … necessary
2.Old beliefs die hard:even when jobs became -----,the long-standing fear that
unemployment could return at a moment’s notice ------.
A.vacant … perished B.easier … changed
C.plentiful … persisted D.protected … subsided

D 氧气是每个生物都不可缺少的.（condition是条件环境的意思用在第一个空合适）然而,二氧化碳也同样是生物所需要的（ necessary 需要的）这俩空都是根据句意翻译而选出的.
C吧难以消除的旧的信念.甚至当工作机会有很多的时候,长期没有工作的恐惧也能占据上风.

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