My mom lives alone (独自) and works at a hotel. One day, on her way home from work, she saw a 1 It was very small and had white and black hair. At first, she just walked by quickly – it was a really windy afternoon. But the cat 2 my mom a long way. It seemed very hungry and 3  . At last it walked into my mom's heart and life.

    A week later, I went to visit my mom. She told me excitedly 4 her little cat. I saw it for the first time. The cat wasn't afraid of 5 at all. When I called its name, it looked at me with its big eyes and said "meow" to me, and then walked over slowly. It was so cute that I 6 it right away.

    This cat makes my mom laugh. She is always happy with the cat around. The cat will stay in the room 7 it feels cold or just doesn't want to be outside. My mom loves it and always tries to make it feel 8 The cat loves my mom, too. It must think of my mom as its mom. It is really attached to (依恋) her. It makes her 9 full of love and happiness. It makes me happy, too, because I love to 10 the smile in my mom's eyes.

甲在t时间内做功W，功率为P_l；乙在t时间内做功2W，功率为P₂，则下列关系中正确的是（　　）

若等腰三角形一腰上的高等于腰长的一半，则这个等腰三角形的底角为 (     )

如果实数x，y满足$\left\{\begin{array}{c}x-4y+3\le 0\\ 3x+5y-25\le 0\\ x\ge 1\end{array}\begin{array}{c}\\ \end{array}\right.$，目标函数z=kx+y的最大值为12，最小值为3，那么实数k的值为(     )