文章前两句“When the explorers first set foot upon the continent of North America, the skies and lands were alive with an astonishing variety of wildlife. Native Americans had taken care of these precious natural resources wisely.”(当探险家们第一次 踏上北美洲大陆时,天上和大地上有许多各种各...
B. because his father injured his eyes by accident C. because he himself injured one of his eyes accidentally when he was three D. because his good eye was infected and lost its sight 7.How did Braille think about Charles Barbier‘s alphabet code? A. Complicated. ...