在“观察水沸腾”的实验中，四位同学根据实验数据分别作出了温度随时间变化的图线（如图），其中正确的是（　　）

抗体是一种特殊的（    ）

用所学知识回答下面问题：

①“小小竹排江中游，巍巍青山两岸走”中，关于“巍巍青山两岸走”的参照物是____．

②小丽在测一个物体长度时记录的数据为14.51dm、14.50dm、14.53dm，物体长度测量值应记为____dm．

A Concert

    The Newtown School will have a concert on Children's Day. Ann, Ken and David will play together in the concert. Ann will play the piano, Ken will play the guitar, and David will play the drums. Mocky will not play in the concert, but he will go, too.

    All the children and their parents are at the concert, but David will not be there because he is not well today. Who will play the drums? Ken and Anil are worried. But Mocky can play the drums. Believe it or not, he can play really well.

I like this pair of boots, can I try ____on? (it)