A fun way to quiz yourself on the 50 U.S. capitals! Just click the browser icon, and answer the interactive flash card that pops up.
The extension keeps track of how well you do with each capital, and quizzes you more on the words that are hardest for you. You can also choose between three answer modes - multiple choice, type-in with autocomplete, or type-in.
谷歌浏览器、其他Chromium内核的浏览器
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