在平面直角坐标系中，点P（2，1）向左平移3个单位得到的点在（　　）

A．第一象限

B．第二象限

C．第三象限

D．第四象限

Why should the SES operators be very careful when the ship enters the area where three ocean regions overlap? Because（）.

A.the weather is always terrible

B.the condition there is complicated

C.the signals are too p

D.their SES may recive the signals from unwanted satellite