题目

下列选项中物质的俗名、用途、化学式、类别完全对应正确的是________  选项俗名用途化学式类别 A食盐除铁锈NaCl盐 B生石灰补钙剂CaO氧化物 C火碱除油污NaOH碱 D纯碱制玻璃Na2CO3________ 答案：【答案】C；盐  【考点】化学式的书写及意义  【解析】【解答】解：A．食盐是氯化钠的俗称，其化学式为NaCl，是一种重要的工业原料，在生活中常用作调味剂，但不能用来除铁锈，故错误；  B．生石灰是氧化钙的俗称，具有腐蚀性，不能用作补钙剂，故错误； C．火碱是氢氧化钠的俗称，化学式 第二节  短文改错（每小题1.5分,共15分） 此题要求改正所给短文的错误。对标有题号的每一行作出判断：如无错误,在该行右边横线上划一个勾（√）；如有错误（每行只有一个错误）,则按下列情况改正： 该行多一个词：把多余的词用斜线(\)划掉,在该行右边横线上写出该词,并也用斜线划掉。 该行缺一个词：在缺词处加一个漏字符号（∧）,在该行右边横线上写出该加的词。 该行错一个词：在错的词下划一横线,在该行右边横线上写出改正后的词。 注意：原行没有错的不要改。 It happened in a morning that I was walking in the street .                  76．___________ I ate up a banana and threw its peel on the corner of the road                77．___________ Shortly after that I hear a scream behind .I looked back to                  78．___________ see what was happened .A little girl about 8 years old fell                   79．___________ down and the banana peel was exactly under his left shoe                    80．___________ She stood up without cry .Then she picked up the banana peel        81．___________ and ran toward the dustbin . On that moment ,I realized my fault , and went to                         82．___________ apologize her for that ,but my vanity (虚荣心)prevented me .                83．___________ The little girl had taught me a good lesson by her action .                   84．___________ And now, after I do everything , I'll think carefully whether        85．___________ it's right or wrong . I'll do my best to be in good habits and Qualities.