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     Food is very important. Everyone needs to eat well if he wants to have a strong body. Our minds

also need a kind of food. This kind of food is knowledge(知识).

    When we are very young,we start getting knowledge. Kids like watching and listening. Color pictures

especially interest them. When kids are older,they enjoy reading. When something interests them,they

love to ask questions.

    Our minds,like our bodies,always need the best food. Studying on our own brings the most knowledge.

    If someone is always telling us answers,we never learn well. When we study correctly(正确地)and

get knowledge on our own,we learn more and understand better.

1. Everyone needs to eat well because it can help people _______.

 A. to be healthy           

B. to study well    

C. to enjoy learning        

D. to have a happy life

2. Our bodies need _______.

A. books    

B. rice   

C. food        

D.  drink

3. We start getting knowledge _______.

A. when we are old      

B. when we are very young

C. when we are pupils    

D. when we are parents

4. How do kids get knowledge?

A. They watch.                  

B. They eat.

C. They listen to the teacher.  

D.  They just learn by themselves.

（10分）NaNO₂俗称“工业盐”，其外观与食盐相似，易误食而中毒，可通过化学实验加以鉴别。如向NaNO₂的酸性溶液中加入KI固体，析出的碘可以使淀粉溶液变蓝色，据此检验NO₂^—。

请回答下列问题：

（1）写出上述反应的离子方程式                                                 。

（2）日常生活中若需鉴别工业盐和食盐，现有碘化钾淀粉试纸，则还需选用的生活中常见物质的名称为              。

（3）某工厂废切削液中含有2%—5%的NaNO₂，直接排放会造成水污染，但加入下列物质中的某一种就能使NaNO₂转化为不引起污染的N₂，该物质是           ，

a．NaCl                              b．H₂O₂               c．NH₄Cl                 d．浓H₂SO₄

所发生反应的离子方程式为：                                       。

在员工素质测评量化中，( )可以被看作二次量化。

A．类别量化

B．顺序量化

C．实质量化

D．模糊量化

E．等距量化

《海关估价协议》规定，进口成员海关应在最大限度内以进口商实付或应付成交价格作为货物完税价格。

儿童不属于丙烯酰胺的高摄入量群体。