Previewing is a strategy that helps us get the basic understanding of a piece of writing before we start reading it. After previewing a text, we should know how long it is, what genre it belongs to, and what it tells about. The table of contents can help us out a lot in this as it contains the titles and subtitles used to organize the text. This way, we will be able to recall things we already know about the topic we will be reading about.
I'm sure there were some differences but no matter what slaves were treated like property and work forces. They were used to complete a task in both the US and South America, they were treated poorly as well.
The answer to your question would be prohibited as it does mean to be forbidden or not allowed to and on this sentence is saying that since it was too noisy it was impossible to study.
