是一个打字计时练习的程序,在缓冲区中预放了一些字母,运行时,可按照屏幕上 显示的字母输入练习,每输入完一行按回车键后,可显示出练习输入的时间.-Is a timed typing exercise program, in the buffer pre-put some letters, run-time, in accordance with the letters on the screen enter practice, the input end of each line press