GRE Text Completion: Fundamental 24 Sets-GRE填空基础24套 - Z05CFD6D990HRKME!

Oceanographers have identified more than 50 "dead zones" around the world: areas of sea that various forms of pollution have rendered ____________ life. A. conducive to B. invaluable to C. bereaved of D. expedient to E. bereft of F. imperative to