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Reading Comprehension

46. According to the text, molecules can completely escape from a liquid only when they - (1) form the surface layer of a liquid (2) are in a gaseous state (3) have enough energy to pass through the boundary surface of the liquid (4) have enough energy to escape the attraction of surface molecules mentioned in the second paragraph refers to the state in which - (1) evaporation begins to occur (2) all the molecules of a liquid (3) a liquid gains from the air surrounding it as many molecules as it loses (4) the temperature of a liquid is the same as that of the air above it have been converted into vapor 48. The phrase "this condition" in line 11 refers to - (1) saturation of the air above a liquid (2) the process of evaporation (3) the high energy of some molecules in a liquid (4) the physical state of a liquid 47. The condition of equilibrium

49. The primary purpose of the last paragraph is - (1) to explain how evaporation affects the human body (2) to explain the effects of temperature on the process of evaporation (3) to explain how weather affects the saturation point (4) to explain how the human body functions differently in different types of weather 50. The best title for this text would be - (1) Evaporation and Human Physiology (2) The Physical Processes of Evaporation (3) Experiments with Evaporation (4) How Evaporation Produces Cooling

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