自点A(-1,4)作圆 ${\left(x-2\right)}^2+{\left(y-3\right)}^2=1$的切线，则切线长为（   ）

     Yesterday my sister and I went____(buy)something for her birthday．She didn't really know what____(get)but she seemed____(like)the idea of a pet，so we went to the nearest pet shop．She started ____(look)around at an the animals．The man in the shop advised her ____(choose)the rabbits，but when she saw some puppies(小狗) ____(play)in the box，she said she would like____(have)one of them．I didn't know if we had enough money____(buy)one and I hoped my mother would want us____(have)a dog in the house，but my sister promised____(look after)it well and we had enough money，so we bought a little brown dog.

***曾对一位外国来访的同志说：“1927年，老蒋够厉害啦！他把我们像鸡蛋一样地摔在地上，可他没想到，当时国外的许多智者也没有想到，我们还会孵出小鸡来！”对“孵出小鸡来”最准确的理解是（      ）