如图表示人体某种免疫过程.下面有关叙述正确的是( )
A:图中细胞A表示淋巴细胞
B:该过程是人体免疫的第三道防线
C:该过程属于特异性免疫
D:该防线能抵御多种病原体
从方框中选择适当的单词完成短文。
What's this on the table? It is a ____ of my new classroom. ____ at the picture. ____ can you see ____ the classroom? I can see a ____ desk in the front of the classroom. Some books are ____ the desk. I can see two white ____ , too. There are____ colored chalks (彩色粉笔n them. ____ is the broom (扫帚)? It’s ____ the door. I like this new classroom.
******5年内3次视察兰考,两次为焦裕禄精神落泪。焦裕禄被誉为 ( )
Look at my watch. It's 8 _______.
在△ABC中,A=3π4,AB=6,AC=32,点D在BC边上,AD=BD,求AD的长
我国共有5个自治区,它们分别是( )