选择最佳应答语( )
A:Who are you?
B:She is fine.
C:Speaking,please.
若直线ℓ过点P(x0,y0)且与直线Ax+By+C=0垂直,则直线ℓ方程可表示为( )
下列句子中,标点使用正确的一句是( )
— Can you r____ my telephone number?
—Yes, I can.