当你的好朋友作业不会做时，要求抄你的作业时，你的爱心应该表现在 （   ）

完成反射的神经结构是(　　)

阅读理解A
    I'm Linda．I can't find my keys．I lost them this morning．There is a Lost and Found box in our classroom．My keys may (可能)be in the box．
    Oh, there are many things in the box．This is a pencil box．What color is it? It's yellow．That is a white eraser．And what's that? It is a watch．A picture of a CD is on it．It's Sara's．Wow! I find my keys．One is to my classroom，and the other (另一个)is to my house．That green cup is Jack's．This baseball is his，too．I will(将)ask him to take his things．Three rulers, two pencils and two nice pens are also in the box．Whose are they? I don't know．
根据材料内容判断正误。

下列实验现象的描述正确的是（   ）

蜻蜒的幼体生活于水中，具临时性呼吸器官，称为：