设集合A={（x，y）||x|+|y|≤2}，B={（x，y）∈A|y≤x²}，从集合A中随机地取出一个元素P（x，y），则P（x，y）∈B的概率是（　　）

下列诗文默写与原文一致的一项是（     ）

阅读下列短文，从每小题的三个选项中选出最佳选项。

    Hello, I'm Ann. This is my family. There are five people in my family. My grandparents are old. They are teachers. My father is tall. He has a white shirt. He is a fireman. He is not afraid of fire. He can help people. He likes his job. My mother is tall and beautiful. She has long hair. She has a yellow skirt. She is a nurse. I don't have any aunts. What about you?

找出下列词语的反义词。

开始—____        离去—____