Sylvia's speech indicates that she lives in a socio-economic area where she has little or no exposure to Standard English or to the ways of life of other levels of society, outside her neighborhood. Despite her underprivileged state, however, Sylvia's words and their import (significance and meaning) also demonstrate that she is intelligent and thinks for herself because she notices faults in people and is skeptical about things.
Like many children of her socio-economic area, Sylvia has doubts about adults who are outsiders. This skepticism suggests Sylvia's intelligence because she is apparently very attentive to those who are in her environment, and she is distrustful of others' judgments.
And [Miss Moore] was always planning these boring-ass things for us to do. . . . And our parents would yank our heads into some kinda shape and crisp up our clothes so we’d be presentable for travel with Miss Moore, who always looked like she was going to church, though she never did. Which is...
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