小玲同学对所学部分化学知识进行了如下归纳，其中有错误的一组是_爱下问搜题

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问题选择题

小玲同学对所学部分化学知识进行了如下归纳，其中有错误的一组是（　　）

A．物质的性质和用途：N₂性质稳定----填充食品袋防腐，CO具有还原性----可冶炼金属

B．安全常识：居室装修----常开窗通风，防甲醛中毒，电器着火----用泡沫灭火器

C．元素与人体健康：缺铁----易引起贫血，缺钙----易得佝偻病或骨质疏松

D．日常生活经验：区别硬水与软水----常用肥皂水检验，区分羊毛纤维与合成纤维----灼烧后闻气味

答案

A、物质的性质决定物质的用途，氮气的化学性质稳定，可用来作食品保护气，一氧化碳具有还原性，可用来冶炼金属．故A正确

B、泡沫灭火器喷出的泡沫中含有水分，会导电，电器着火用泡沫灭火器灭火会发生触电事故，应该干粉灭火器或液态二氧化碳灭火器来灭火．故B错误

C、铁是构成血红蛋白的必须微量元素之一，缺铁会引起贫血，钙在人体中主要存在于骨骼和牙齿中，缺钙易得佝偻病或骨质疏松．故C正确

D、区分硬水和软水用肥皂水，在硬水中加入肥皂水不产生或只产生少量的泡沫，在软水加入肥皂水会产生大量的泡沫；羊毛纤维和合成纤维可用灼烧的方法来区分，羊毛纤维点燃后有一股羽毛烧焦的气味，合成纤维点燃后会迅速熔化成一个黑色小球．故D正确

故选B．

问答题简答题

简述土、土力学的定义。

完形填空

When we read books we seem to enter a new world. This new world can be similar to the one we are living in, or it can be very __50__. Some stories are told as if they were true. Real people who live in a __51__ world do real things; in other words, the stories are about people just like us doing what we do. Other stories, such as the Harry Potter books, are not __52__. They are characters and creatures that are very different from us and do things that would be impossible for us.
But there is more to books and writing than this. If we think about it, even realistic writing is only __53__. How can we tell the difference between what is real and what is not real? For example, when we read about Harry Potter, we do seem to learn something about the real world. And when Harry studies magic at Hogwarts, he also learns more about his real life than __54__. Reading, like writing, is an action. It is a way of thinking. When we read or write something, we do much more than simple look at words on a page. We use our __55__, which is real, and our imagination, which is real in a different way, to make the words come to life in our minds.
Both realism and fantasy (幻想) use the imagination and the “magic” of reading and writing to make us think. When we read something realistic, we have to __56__ that the people we are reading about are just like us, even though we __57__ that we are real and they are not. It sounds __58__, but it works. When we read, we fill in missing information and __59__ the causes and effects of what a character does. We help the writer by __60__ that what we read is like real life. __61__, we are writing the book, too.
Most of us probably don’t think about what is going on in our __62__ when we are reading. We pick up a book and lose ourselves in a good story, eager to find out what will __63__ next. Knowing how we feel when we read can help us become better __64__, and it will help us discover more about the real magic of books.

A．instructive

A．think about

D．forget about

C．On the contrary

C．professionals