— Yes. It is beautiful and has many colours.
除去二氧化碳中混有少量一氧化碳的方法是( )
________ Dongtai you see today is _______ different city from what it used to be.
四名学生解二元一次方程组3x-4y=5x-2y=3提出四种不同的解法,其中解法不正确的是( )