HiSET Reading Practice Test

The main idea being tested is the function of a topic sentence: it states the main idea or focus of the paragraph. A topic sentence acts as a guidepost, signaling to the reader what this paragraph will argue or explain. It helps keep the writing focused by tying back to the overall thesis and by making sure every following sentence serves that purpose. The rest of the paragraph should provide details, examples, or evidence that develop that central idea and show how it works. Think of the topic sentence as the paragraph’s compass: it tells you what the paragraph is about and what to expect, so the reader can follow the logic more easily. The other sentences then fill in with support that stays on topic and explains or elaborates the idea introduced by the topic sentence. The option that says a topic sentence presents supporting evidence isn’t correct because the evidence usually follows to back up the idea stated in the topic sentence. A conclusion belongs at the end of the piece, and introducing unrelated facts would disrupt coherence.