曲线$\rho \cos \theta +1=0$的直角坐标方程为（   ）

    Three small fish lived in the sea. When they were very young, their parents died. They had to 1 each other day after day. Finally, they grew up and are 2 enough to swim deeper and further.

    One morning. the three fish were 3 to a shallow (浅) water by a big wave (浪). A small boat was taken there, too. It was hard for the fish to go back to the sea because the boat was right in front of them. The largest fish realized that they were 4 and said they had to find a way to leave there as quickly as possible. The second largest fish 5 with his elder brother, but the youngest one did not. He said that there was much 6 for their activities, so he would not worry at all and still swam around 7. At last, the largest fish returned to the 8 by jumping over the lowest part of the boat. The second largest fish also succeeded in 9 his elder brother in the other side of water. But the youngest one didn't follow them and still swam joyfully.

    Two hours later, when the 10 rose up, the water in the small shallow corner dried up. The fish who did not try to return to the sea died of lack(缺乏) of water.