I think Chinese ____(字) are more difficult to learn than English.
A. Oh, I'm sorry.
B. It's green. We can go.
C. They're waiting.
D. I'm going to work.
E. Thank you.
如图,抛物线y= 14 x2+bx+c与x轴交于A(5,0)、B(﹣1,0)两点,过点A作直线AC⊥x轴,交直线y=2x于点C;
在平面直角坐标系中,点P(6-2x,x-5)在第四象限,则x的取值范围是( )
目前撒哈拉以南非洲还比较落后,如果让你帮助非洲摆脱贫困,那么不应该做的是( )
若要让一株桃树上的枝条既开红花,又开白花,园艺师可采用的方法是( )