脱式计算。（能简算的要简算） （1）(30-19.8) ×0.6+31.2（2）

由H、C、O、Na、Cl五种元素中的一种或多种组成八种下列初中化学常见物质，关于这七种物质有下列描述：

①A是生命活动最重要的气体，在一定条件下可以转化成B；

②B能与C反应生成D和E，其中B和E常用作灭火剂；

③D能与B、E发生化合反应生成F；

④D和F均能与G反应生成H，每天摄入适量的H，对维持人体内水分和体液恒定的pH有重要作用。

请根据描述回答下列问题：

（1）A物质的化学式为         。C物质在日常生活中的重要应用是         （举一例）。

（2）D→F的化学方程式为         。

（3）F与G反应的化学方程式为        。

（4）实验室以H为原料，利用右图所示装置制取G，A处发生反应的化学方程式为         。关于该实验，下列说法不正确的是（填字母）       。

A．制备装置与实验室制取CO₂相同     

B．该实验的尾气可以用碱液吸收

C．该气体的收集方法与氧气的收集方法完全相同       

D．检验该气体是否收集满，可以向集气瓶中滴加紫色石蕊试液

When I was a kid, I always used to wonder how in the world my father work outside in the winter without a coat. It could be minus 20 degrees centigrade and there’d be Dad, removing snow, or perhaps chopping some wood --- his coat thrown  aside--- wearing a shirt , a cap, and a pair of gloves.

“Aren’t you cold, Dad?” I’d ask. “No,” Dad would reply. “I’m not cold--- working too hard to be cold.”

Many times I wondered whether my father was an extremely tough man, or whether he was foolish.

One time when I was quite young, perhaps five or so, I went ice fishing with Dad. It was a bright, clear day—and bitterly cold.

After we’d been out on the ice for a little while, my feet started getting cold.

“Daddy, my feet are cold.” I said.

“Yeah, it’s cold out here today,” he replied.

“Tell you what,” he said. “Walk around. Make some circles in the snow. See how many different patterns you can make. That will get your feet warm.”

Now, I was just a little girl at the time but I remember thinking, “How in the world will walking around in the snow make my feet warm? Dad must be out of mind.

But he was my father, after all. I made circles in the snow. I made squares. Pretty soon I was having so much fun making patterns in the snow. I forgot about my feet being cold.

Now, all these years later, I know, too, from personal experience how my father was able to take his coat off and work outside in the winter wearing just a shirt, a cap and gloves. Because I do it, too. “Aren’t you cold?” my husband asked one winter day. “No,” I replied. “I’m not cold—working too hard to be cold.”

I hope my husband has decided I’m both tough and smart. But I guess quite a bit of the time he thinks I’m foolish.

Wherever Dad is in that great big farm in the sky—I’m sure he can’t help but smile whenever I take my coat off while I’m working outside in the winter.

小题1:When the author’s feet felt cold, her father advised her to              .

A．go home alone first

B．keep walking in the snow

C．draw pictures in the snow

D．light a fire on the ice小题2:Hearing her father’s advice, the author thought her father              .

A．forgettable

B．warm-hearted

C．crazy

D．cruel小题3:What might the author’s husband think of her?

A．Tough

B．Smart

C．Brave

D．Foolish小题4:The author’s purpose of writing this passage is to              .

A．remember her tough and smart father

B．show how her father cared about her

C．describe memories of her childhood

D．explain why her father loved her so much

试述破伤风的治疗原则。

女性参加单位的年终总结大会，应穿（）。

A.深色西装套裙

B.晚礼服

C.长袖体恤配牛仔裤