酚类主要来自工业排废，又是染料、制药、树脂含成等工业的重要原料。动、植物代谢及机体分解也有酚类物质生成，故酚类物质与人类关系极其密切。酚类物质虽毒性不高，但多有恶臭，是卫生检验的重要项目
哪些是4-氨基安替吡啉法测定挥发酚的优点？（）
A.该方法灵敏度高，不加衍生处理，最低检测浓度达0.002毫克／升
B.适用的浓度范围宽0.002~5.0毫克／升
C.所需设备简单，操作方便
D.4-氨基安替吡啉与对硝基酚，邻-硝基酚有阻止反应，与间硝基酚也有部分阻止反应
E.低卤代酚类与4-氨基安替吡啉反应，其显色强度比非卤代酚要强
参考答案：A, B, C
| 阅读理解。根据短文内容，用简洁的句子或短语完成下列表格。 | ||||||||||||
| A Letter From Mars Dear Earthmen, I have enjoyed my stay on your interesting planet. I think I understand the life on earth now and I would like to give my impressions (印象). First of all you live in boxes. Every morning you leave your big boxes and get into smaller boxes on wheels (轮子). All these small boxes run around and around, and finally stop to rest. You leave these boxes on wheels a nd go to very large tall boxes. After resting all day you get back in your little boxes and return to your big boxes. There you sit and look at every small glowing (闪闪发光的) boxes with moving pictures on the front. There is only one thing I don't understand. I went to a football game one day. A group of angry boys fought a little round ball. Everyone shouted but they kept fighting. They were angry, because they had been kept in boxes all day. I think. Thanks you earthmen for this chance to get to know you. Yours The man from Mars | ||||||||||||
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