... 44 PART I: GRE Basics Because frogs have no hair, skin, or feathers to protect their paper-thin skin, they are _ changes in the quality of the air and water in their ... determine the relationships among the various parts of the passage, and to draw reasonable inferences from the material in the passage The passages cover a variety of subjects, including the humanities, ... verb, or adjective) as the original If a particular word could be considered as one of two or more parts of speech, then the other words in the question will reveal which part of speech you should...