Using a dictionary and/or thesaurus gives you a wide-range of vocabulary, as well as their definitions, that can enhance the meaning of your writings immensely. They also help when it comes to your comprehension skills, and how well you can understand and analyze a text.
If this is from Great Gatsby, the answer would be that Tom is <u>racist</u>. He talks about how they need to "purify the race" etc.
Use this response: The percentage of workers in agriculture is higher than the GDP percentage. I hope this helps.