如图甲所示，有一种圆柱形薄壁烧杯，它的底面积为50cm2，烧杯自重1.2N，置于水平桌面上，在烧杯内倒入200mL的盐水时，杯底所受盐水的压强为440Pa．（g=10N/kg）．求：
选出正确的单词。
dress T-shirt dress short dresses shirt blouse shorts
药王孙思邈著（ ）
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.
①这一阶段从1978年算起，至少需要一百年的时间
②这一阶段，就是我国社会主义的不发达阶段
③是党和国家制定路线、方针和政策的根本依据
④处于这一阶段，只是经济方面的问题，即生产力水平比较低
