大学英语六级

radial radiant radiator radical radius raise raisin rally ramble ranch random range rap rapidity rapture rascal rash rate rational rattle reactor realistic realization rear reason rebuke receiver recipe reciprocal reckless reckon reclaim recognition recommendation reconcile recreation rectangle rectify reed reef reel referee reference refinery refrain refreshment refugee regenerative regime regiment regularity regulate regulation reign reject relay religion remainder repay repeal repel replace replacement report representation representative reproduce reproduction reptile requisite resemblance resent reservation reserve reside resident residual resign resignation resolute respectable response responsible restrain resultant resume retail retard retirement retort reveal revenue reverse revive revolve ridicule rigorous rim rinse riot rip ripple roam roller Roman romance romantic rooster rotate roundabout routine row royalty ruby rule ruthless