下列句子中，没有错别字且加点的字的读音正确的一句是

下列选项中没有体现关爱集体的是（  ）

根据短文内容，选择最佳答案。
B
    Hello! My name is Kate. This is my bag. It's a nice bag, right? It is from my mother.
    What's in my bag? A ruler is in it. And the ruler is white. It's not mine. It's Lily's. Lily is my sister. She likes white but I don't. Two pencils are in it, too. One is red and the other is blue. They are mine. Look, a nice watch is in it. The watch is white and blue. It's mine and it's from my father. A notebook is in my bag, too. The notebook is yellow and blue. Is this notebook mine? No, it's Anna's. Anna is my cousin. She likes yellow and blue very much.

已知集合A={x|（x﹣a）x﹣（a+3）≤0}（a∈R），B={x|x²﹣4x﹣5＞0}．

已知a，b，c分别是△ABC的三个内角A，B，C所对的边，且c²=a²+b²﹣ab．