在下列物质：烧碱，NH3•H20，SO3，铁片，石墨，甲烷，醋酸，碳酸钙中，属于电解质的是______，其中属于强电解质的是______，既不属于电解质又不属于非电解质的是______．
电解质为在溶液中或熔融状态下能够导电的化合物，满足该条件的有：烧碱、一水合氨、醋酸、碳酸钙；
强电解质在溶液中能够完全电离，满足条件下的为：烧碱、碳酸钙；
既不属于电解质又不属于非电解质的为单质或混合物，满足条件的有：铁片、石墨，
故答案为：烧碱、一水合氨、醋酸、碳酸钙；烧碱、碳酸钙；铁片、石墨．
| 阅读理解。 |
| Which of your hands do you use most ? Very few of us use both of our hands well. Most of us are right- handed. Only about five people out of a hundred are left-handed. New-born babies can take things with either of their hands, but in about two years they like to use their right hands. Scientists don't know why this happens. They have studied it. They think our animal ancestors (祖先) are right-handed. This may not be true. Monkeys are our closest relations in the animal world. Scientists have found that monkeys like to use one of their hands more than the other-but it can be either hand. There are as many right-handed ones. Next time you visit the zoo, watch the monkeys carefully. You'll see that some of them will swing (摆动)from their right hands and others will use their left hands. But most human beings (人类) use their right hands better and this makes life difficult for the left-handed ones. We live in a right-handed world. |
| 1.Very few of us can use both of our hands well. It means ________ . |
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| A. we can't use one as well as the other B. we can't use both hands C. many people can use one as well as the other D. some of us can use both hands |
| 2. New-born babies ________ at first. |
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| A. can only use their right hands B. can only use their left hands C. can't use their hands D. can use both their hands |
| 3. Which of the following is true? |
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| A. Monkeys are left-handed. B. Monkeys are right-handed. C. Some of the monkeys are left-handed, and others are right-handed. D. There are much more right-handed monkeys than left-handed monkeys. |
| 4. We live in a _________ . |
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| A. left-handed world B. right-handed world C. monkey world D. animal world |
| 5. The left-handed people are difficult in life because __________ . |
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| A. they can't use their right hands at all B. most people use their right hands better C. they can't use both of their hands D. they can't use their left hands |