According to the article It All Adds Up about ethnic differences in school performance, which ethnic group spends the most time doing homework?

Compared to deaf adults exposed to sign language from birth, those who first learn sign language as teens are less likely to:

a. correctly imitate the signs they are shown. b. use signs to indicate concrete objects. c. mentally associate signs with written words. d. comprehend grammatical subtleties of sign language.

The percentage of alcohol in your blood is called the

a) toxic range. b) consumption percentage. c) poisoned blood percentage. d) blood alcohol concentration.