Hello! Welcome to our new classroom.What's in the classroom? Look! A big blackboard, a teacher's desk, six pictures, many desks and chairs and a new computer in it.You can see eight new fans and four big lights.The wall is white and the floor is blue.The door is orange and the windows are green.My desk and my chair are near the window.I like my new classroom.

唾液是口腔中分泌的一种____，所以不要随便吐掉。细细咀嚼馒头会有感觉有甜味，是因为唾液将食物中的____转化为____。

先化简：1－$\frac{a-1}{a}÷\frac{a^2-1}{a^2+2a}$，再选取一个合适的a值代入计算．

1路车从火车站开往动物园，经过的车站有____、____、____．

2路车从世纪广场开往长途汽车站，经过的车站有____、____、____．

小亮从体育场到动物园，应乘____路车，经过____站．

李老师从火车站到长途汽车站，先乘____路车到____，再乘____路车到长途汽车站．