有一包白色固体，可能含有Na₂SO₄、Na₂CO₃、BaCl₂、KNO₃中的一种或几种。取样溶于水，有白色沉淀产生；过滤后向沉淀中滴加稀盐酸，沉淀的量与加入盐酸体积的关系如下图所示。由此推断白色固体中（）

***主席在文艺T作座谈会上强调，“文艺批评就要褒优贬劣、激浊扬清，像鲁迅所说的那样，批评家要做‘剜烂苹果’的工作，‘把烂的剜掉，把好的留下来吃”’。这说明（    ）

①联系是普遍的，事物都处于自在联系中

②部分的功能及其变化会影响整体的功能

③事物的发展是辩证否定的过程

④整体的功能状态及其变化会影响到部分

词形转换
There are some ____ at school. (boy)
 Is this ____ classroom? (we)
There are five____ in the room. (child)
 Are there ____ boats in the river? (some)
There are three____ and four __________ in the picture. (man, woman)
Mary, is this ____  bottle of coke? (you)
Daming ____ (be not) in Class Three.
I have two ____ (pencil-box)
Bill is from ____ . (American)
What are____ .(that)
Are you in ____  One? (grade)
There are two ____ on the wall. (picture)
Look! These____ are good. (cake)
Are these ____  apples? (you)
Lingling is from ____ . (Chinese)