A:have I felt
B:I have felt
C:had I felt
D:I had felt
已知方程组2x+y=4x+2y=5,则x+y的值为 ____.
地球,我们共同的家园,江山如画,景象方千。下列说法正确的是( )
扬____起(yánɡ yán) 汉____族(hàn hàng)
摔跤____(jiáo jiāo) 坪坝____(bà pà)
打扮____(bàn pàn) 凤____尾竹(fèn fèng)