（1）离子反应是中学化学中重要的反应类型．人们常用图示的方法表示不同反应类型之间的关系．如分解反应和氧化还原反应可表示为左图．右图为离子反应、氧化还原反应和置换反应三者之间的关系，表示离子反应、氧化还原反应、置换反应的字母分别是____ ．

（2）离子方程式是重要的化学用语．下列是有关离子方程式的一些错误观点，请在下列表格中用相应的“离子方程式”否定这些观点．

反应物从下列物质中选取：Na、Al、H₂O、H₂SO₄、HCl、NaOH、Ba（OH）₂、CuCl₂

画一画，填一填。

两个完全一样的三角形可以拼成一个____。

两个完全一样的正方形可以拼成一个____。

探索建设社会主义道路良好开端的是（    ）

    Look at this photo. It's a photo of my two good friends and me. The boy is Tom. 1 is from America. The girl 2 red is Helen. She is from England. And I'm from Australia, my name is Lucy. We3 in the same (相同的) school.

    Tom likes sports very much. He often 4Ping-pong, baseball and basketball after class. He has a great sports collection: some ping-pong balls, two ping-pong bats, eight baseballs and two 5. He thinks it's relaxing and 6 to play sports every day.

    But Helen thinks it's boring. She 7 sports every day. She likes 8. She has many books. She reads every day. I don't have a great collection. 9 I play sports every day. I also (也) 10 sports shows(  节目 ) on TV. I think sports are good for me.

a．氧化性   b．还原性   c．不稳定性   d．挥发性   （用序号填空）

①浓硝酸要避光保存在阴凉处，是因为浓硝酸具有　 ____　；

②浓硝酸可使铁、铝产生钝化现象，是因为浓硝酸具有　 ____　；

③打开浓硝酸的瓶盖，可见到白雾，是因为浓硝酸具有 ____