考研英语高频词汇grade n. 成绩;年纪;等级<历年真题考查频次:43次>真题复现1:A study last year by the National Center for Science Education, a non-profit group of scientists and teachers, looking at how state public schools across the country address climate change in science classes, gave barely half of US states a grade B+ or higher. (2023年英语一text1P5)