—How does he go to school every day?
—He ____ to school every day.
秦岭—淮河一线为重要的地理界线,下列界线与其大体一致的有:①亚热带与暖温带界线 ②湿润区与半湿润区界线 ③季风区与非季风区界线④800mm等降水量线 ⑤内流区与外流区界线 ⑥一月0℃等温线
把多项式a²-4a分解因式,结果正确的是( )