The art of mosaic involves creating images by assembling small pieces of colored glass, stone, or other materials. This art form has been practiced for thousands of years, dating back to ancient Mesopotamia. The small pieces, called tesserae, are painstakingly placed into a bed of wet cement or adhesive. Once the design is complete and the adhesive has dried, a substance called grout is spread over the surface to fill the gaps between the tesserae. After the excess grout is wiped away, the finished mosaic reveals a detailed and durable work of art. Many ancient Roman mosaics have survived to this day, showcasing the lasting beauty of this technique.
The passage is mainly about...
- the history of art in ancient Roman and Mesopotamian civilizations.
- the process of creating a mosaic and its long-lasting nature. (correct answer)
- the materials, such as glass and stone, that are called tesserae.
- the use of grout and other adhesives in different forms of art.
Explanation: When you see a "main idea" question asking what a passage is "mainly about," you need to identify the central theme that connects all the key points discussed throughout the text. This passage covers three main elements about jazz: where it came from (African American communities in New Orleans in the late 19th/early 20th centuries), what makes it special (improvisation, strong rhythm, call-and-response patterns, blend of blues and ragtime), and how it spread (throughout the country and world, influencing other music styles). Answer choice A captures all these elements perfectly by mentioning "origins, key characteristics, and influence of jazz music." Let's see why the other choices miss the mark. Choice B focuses only on improvisation, which is just one characteristic mentioned in the passage, not the main topic. Choice C narrows the focus to New Orleans itself rather than jazz music—while New Orleans is important to the story, it's not what the passage is mainly about. Choice D suggests the passage compares different musical styles, but it only briefly mentions that jazz blends blues and ragtime traditions; it doesn't actually explain the differences between these genres. For main idea questions, avoid answers that focus on just one detail from the passage, even if that detail is mentioned prominently. Instead, look for the choice that acts like an umbrella, covering all the major points discussed. The correct main idea should make you think, "Yes, that's what the whole passage was trying to tell me."