Read the excerpt from "A Genetics of Justice” by Julia Alvarez. During my early teen years in this country, I knew very little about what was actually going on in the Dominican Republic. Whenever Ia situación on the island came up, my parents spoke in hushed voices. In December 1960, four months after our arrival, Time magazine reported the murder of the three Mirabal sisters, who along with their husbands had started the national underground Dominican Republic. My parents confiscated the magazine. To our many questions about what was going on, my mother always had the ready answer, "En boca cerrada no entran moscas.” No flies fly into a closed mouth. Later, I found out that this very saying had been scratched on the lintel of the entrance of the SIM's torture center at La Cuarenta. What is the central idea of this paragraph?