在平面直角坐标系中，点（1，2）所在的象限是（ ）
A．第一象限
B．第二象限
C．第三象限
D．第四象限
点（1，2）所在的象限是第一象限．
故选A．
If he _____ his legs in the last training, he _____ the coming World Cup, which he has been longing to compete in.
A．hadn’t hurt; would join in
B．hadn’t hurt; would have taken part in
C．didn’t hurt; would go in for
D．didn’t hurt; would have taken part in
如图所示：（1）图甲刻度尺的读数是______cm
（2）图乙中汽车速度计是______km/h．
（3）两面平面镜互相垂直，一束光线斜射到平面镜上，完成光路图丙．
