The two researchers originally set out to study the zebras in Africa and discovered a new species of tiger ______.

A. by chance B. in addition

C. by nature D. in need

 

A

【解析】

試題分析:句意：這兩個研究人員本來動身去非洲是研究斑馬的，他們卻無意中發(fā)現(xiàn)了一種新的老虎物種。A. by chance 偶然地； B. in addition 此外； C. by nature 天生地； D. in need在危難中。選A。

考點：考查短語辨析

 

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