Distinguishing Related Meanings Practice Test

On a field trip, the guide talks about a river after heavy rain. She says the river is swollen because extra water makes it wider than usual. She also says the current is swift, moving quickly around rocks and bends. Students notice swollen describes the size of the river, especially near the banks. Swift describes how fast the water travels, even in narrower spots. The guide warns that a swollen river may cover paths, while a swift current may knock someone off balance. Later, the rain stops and the river becomes less swollen, but parts of it remain swift. Based on the passage, how does the author differentiate between swollen and swift?

In the school kitchen, Jordan watches a pot of soup on the stove. At first, small bubbles rise slowly and pop quietly near the surface. The teacher calls this simmering and says it keeps the soup hot without splashing. A few minutes later, the bubbles grow larger and break the surface everywhere at once. The teacher calls that boiling and warns Jordan to lower the heat. Jordan notices simmering keeps the noodles from tearing, while boiling makes the soup jump and spill. He also sees that simmering happens at a gentler level, even though the soup still looks active. When the pot boils, steam rises faster and the lid rattles loudly. Jordan writes that both actions involve bubbles, but the strength and speed are different. Which sentence best explains the difference between boiling and simmering?