下图为吞噬细胞杀灭病菌的示意图，请据图回答：
吞噬细胞对病菌的这种吞噬作用与细胞膜的（）有密切关系，该过程属于（）免疫。
参考答案：流动性；非特异性
根据语篇情景，用恰当的短语或句子填空，使之意思完整。
This is my room. There is a desk in it. My books and my notebooks are __1__. My family photo is on
the desk, too. In the photo, you can see__2__ , my brother and me. My father likes basketball very
much. We often play sports in the afternoon. I am happy and I love my family very much.
计算：(x－y)(x+y) = .
