已知x₁，x₂是方程x²﹣2x﹣1=0的两根，试求下列代数式的值．

I like ________ basketball.  （  ）

真空中有两个静止的点电荷，它们之间的作用力为F，若它们的带电量都增大为原来的2倍，距离减少为原来的 $\frac{1}{2}$ ，它们之间的相互作用力变为（   ）

若，则下列不等式成立的是（     ）

阅读理解
    Dogs are people's friends. They will do anything their masters (主人) ask them to do and they do their duty very well.
    Curly is my black dog. He is big and strong. He is strong enough to carry me on his1 . He likes running and playing with me. He likes to 2my father around in the fields, too.
   One day my father took off his coat. Put it on the ground 3  a big tree and said to Curly. “  4  my coat.”
Curly sat down on the coat. Then my father remembered he had to5dinner for the family.   6 he went home and forgot all about his coat and dog.  
    Late in the evening I 7 my dog and looked for him everywhere in the yard. I called, "Curly, Curly!" But Curly did not answer.
Soon my father wanted something in his coat pocket (口袋). Suddenly he remembered8  he had done. Quickly he went back to the big tree. What do you think he saw? Curly was 9 sitting on the coat! He was afraid someone would take it10 .