在平面直角坐标系xOy中，已知双曲线$\frac{x^2}{a^2}$-$\frac{y^2}{b^2}$=1$\left(a>0,b>0\right)$   过点P（1，1），其一条渐近线方程为y=$\sqrt{2}$x，则该双曲线的方程为____

   There is an old tiger in the forest (森林). He doesn't want to look for (寻找) food now. He often lets other animals get him some food to eat.
   One day, he sees a monkey and says, “I am hungry, monkey. Go and get me something to eat.” “I can't do that now, tiger,” the monkey says, “There is another tiger over there. He does not let me get anything for you to eat. I am afraid of (害怕) him.” “What?” says the old tiger. “Take me to that tiger. I want to talk to him.”  The monkey and the tiger go to the bridge over the river (河). “Now look down at the water.” says the monkey. “Do you see the tiger?” “Yes, I do,” says the old tiger. “Let me eat him.” Then the tiger jumps (跳) into the river.

 Look! What a nice and clean toilet!   
 Yes. It ______ every morning.

下图“北京至乌兰巴托之间某地区冬春季节某日锋面活动剖面示意图”，读图，图中所示为某日北京时间0时的锋面活动情况，锋面移动速度为40千米／时，该日18时北京的天气状况可能是（    ）