如图表示绿色开花植物一生的相关结构，请分析并回答：

下列气体中原始大气不具有的气体是（ ）

当前我国环境状况不荣乐观，其中PM2.5、CO、SO₂、NO_x等污染物对空气质量的影响非常显著，其主要来源为燃煤、机动车尾气等，因此，对其进行研究具有重要意义，请回答下列问题：

（1）对某地PM2.5样本用蒸馏水处理后，测得该试样所含水溶性无机离子的化学组分及其平均浓度如下表：

根据表中数据计算该试样的pH=____ ．

（2）NO_x是汽车尾气的主要污染物之一．汽车发动机工作时会引发N₂和O₂反应，其能量变化示意图1如下：

①写出N₂和O₂反应的热化学方程式____ ．

②处理尾气时，加装催化转化装置使NO_x与CO转变为无污染的气体排放，请写出该反应的化学方程式　____ 

③有人设想将CO按下列反应除去：2CO（g）=2C（s）+O₂（g）△H＞0，请你分析该设想能否实现？____ （填“是”或“否”），依据是____ ．

④另有人认为以如图2所示原电池原理也可以除去CO，则其正极反应式为　____ ．容器中的CO₃^2﹣离子____ 极移动（填“A”或“B”）．

（3）利用I₂O₅消除CO污染的反应为：5CO（g）+I₂O₅（s）⇌5CO₂（g）+I₂（s），不同温度下，向装有足量I₂O₅固体的2L恒容密闭容器中通入2mol　CO，测得CO₂的体积分数随时间t变化曲线如图3．请回答下列问题：

①T1时化学平衡常数K=____ 　

②下列说法正确的是　____ 　（填字母序号）．

A．容器内气体密度不变，表明反应达到平衡状态

B．该反应的△H＞0

C．d点时，向恒容容器中充入2molCO，再次平衡后，CO₂的含量增大．

D．T₁与T₂化学平衡常数大小关系：K（T₁）＞K（T₂）

某工程队修建一条长1200m的道路，采用新的施工方式，工效提升了50%，结果提前4天完成任务．

阅读以上5段语言材料，请找出与他们相对应的标题，并将其标号填入下列方框内。
    A Friendship Day present plays an important part in developing friendships. We must choose it with love and care. It doesn't need to be expensive, but it must be able to show your love to your friend. If you find it hard to choose a good Friendship Day present for your best friend, here are some good ideas for you.
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    Friendship bands are one of the most popular present on that day. Many colorful friendship bands hit stores much ahead of the Friendship Day. They come in special designs for both boys and girls.
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    Flowers are presents which are popular among girls. Sending flowers is the best and the easiest way to show your love to your friend. If possible, you'd better choose your friend's favorite flower. If your friend doesn't have a specific choice, you can buy yellow roses. Yellow roses are thought to be Friendship Day flowers.
____ 
    Photo albums are good Friendship Day presents. You can place a picture of you along with your friend into a photo album. This reminds both of you of the good time you spent together.
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    21Books are suitable for friends who like reading. Keep your friend in mind while choosing the book. Usually, you can choose an inspirational.
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    If you don't know which present to choose, why not invite your friend to have dinner? That will be a good chance to chat with your friend. I am sure you can have a good meal and a great time.

E.Buying Friendship Bands