从词库中随机抽取一个单词，显示一款可帮助学生背英文单词的小软件，在屏幕上时，该单词被随机隐藏了一个、或两个、或三个字母，用户正确填空后，可得分；当得分累积到某些分值时，系统给予鼓励-Randomly selected from the thesaurus in a word, showing a back to help students of English words of small software, on the screen, the words were randomly hide one, or two, or three letters, the user fill in the blank correctly, may scores　When the cumulative scores of some scores, the system to encourage