A:x2+4
B:x2+2xy+4y2
C:x2﹣x+ 14
D:x2﹣4y
下列城市中自转线速度最大的是( )
照样子,写词语
例:茫茫然 ____ ____ ____
千门万户 ____ ____ ____
Many people are building the factory in the city because it' not good for the environment.