Why does montag memorize the old testament's ecclesiastes and the new testament's revelation? how do the final two paragraphs of the novel allude to both biblical books? this is about the book "fahrenheit 451" by ray bradbury

1. in which sentence is the underlined portion a predicate nominative? for astronauts, going into space to repair orbiting equipment becomes a challenge. for astronauts, going into space to repair orbiting equipment becomes tricky. for astronauts, going into space to repair orbiting equipment becomes challenging. for astronauts, going into space to repair orbiting equipment becomes frequent.