阿司匹林（乙酰水杨酸）已应用百年，成为医药史上三大经典药物之一，至今它仍是世界上应用最广泛的解热、镇痛和抗炎药，也是作为比较和评价其他药物的标准制剂。乙酰水杨酸受热易分解，分解温度为128_~135℃。某学习小组在实验室以水杨酸（邻羟基苯甲酸）与醋酸酐[（CH₃CO）₂O]为主要原料合成该物质，设计的合成路线为：
一、制备K
s*5u
二、提纯
方案1
方案2
主要试剂和产品的物理常数

名    称	相对分子质量	熔点或沸点（0C）	水	醇	醚
水杨酸	138	158(熔点)	微溶	易溶	易溶
醋酸酐	102	139.4(沸点)	反应	可溶	易溶
乙酰水杨酸	180	135(熔点)	微溶	可溶	微溶

请根据以上信息回答下列问题：                   
（1）①合成阿斯匹林时，还会生成一些副产品，其中有一种是高分子，为了分离此物质，方案1中加入A物质为   ▲   溶液。
②本方案抽滤后进行洗涤，其具体操作是   ▲    。
（2）方案2为改进的提纯方法，称为重结晶提纯法。
①该方案中步骤1除了选用乙酸乙酯外，还可选择下列哪些
试剂   ▲   。
A. 乙醇      B. 蒸馏水      C. 乙醚   
②步骤2回流的装置如图所示，写出仪器a的名称   ▲   ，使用温度计的目的是   ▲   ，冷凝水的流向为    ▲   。

③方案2所得产品的有机杂质要比方案1少的原因是   ▲   。
（3）该学习小组在实验中原料用量：2.0g水杨酸、5.0ml醋酸酐（ρ＝1.08g·cm^-3），
最终称量产品m="2.2g" ，则乙酰水杨酸的产率为   ▲    。

New rules and behaviour standards (行为规范) for middle school students came out in March. Middle school is going to use a new way to decide who the top students are. The best students won't only have high marks. They will also be kids who don't dye (染) their hair, smoke or drink. Here are some of the new rules. 

Tell the truth. Have you ever copied someone else's work on an exam? Don't do it again! That's not honest. If you have played computer games for two hours in your room, don't tell your parents that you have done homework.

Do more at school. Good students love animals and care for other people. April is Bird-Loving Month in our country. Is your school doing anything to celebrate? You should join! That way, you can learn more about animals and how to protect them. Have you ever quarreled（吵架）with your teammates when your basketball team lost? Only working together can make your team stronger. Be friendly to the people you are with. Try to think of others, not only yourself.

Be open to new ideas. Have you ever thought that people could live on the moon? Perhaps you'll discover（发现） Earth II someday. Don't look down at anyone. Everyone's ideas are important. You should welcome them, because new ideas make life better for everyone.

Protect yourself. Has someone ever taken money from one of your classmates? Don't let it happen to you. If you have to go home late, you should let your parents know.

Use the Internet carefully. The Internet can be very useful for your studies. But some things on the Internet aren't for kids, so try to look at Web pages that are good for you. You can use the Web for fun or homework.

1.According to the passage, which of the following is not true?

A．Take care of yourself when you are out.      B．Tell the truth, even when you are wrong.

C．Keep some animals to protect them.         D．Use the Internet, but keep away from bad thing

2.The main idea of the fourth paragraph is about         .

A．making the team stronger                 B．working together with others

C．being a good friend to others              D．getting on well with others

3.The passage tells us how to         .

A．be top students                         B．do more at school

C．care for others                         D．use the Internet

 

A: Mum, I have finished my homework .(1) ______.
B: Of course .Which is your favorite TV program ?
A: Sports .It is said there will be a wonderful football match on TV tonight .
B: (2) ______
A: A Chinese team will play against a Japanese team .
B: (3) ______
A: I'm not sure . Ball games are usually shown on Channel 8.
B: (4) ______
A:Well , it must be on Channel 6 then . Try that .
B: Here it is .(5) ______ Let's watch it together .
A: That's all right.