小明同学利用已有的知识弄清家里化肥的成分，他看到袋中化肥是白_爱下问搜题

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问题问答题

小明同学利用已有的知识弄清家里化肥的成分，他看到袋中化肥是白色晶体，用少量肥料跟熟石灰一起研磨，有浓烈的刺激性气味，初步判定是一种氮肥．为进一步证实肥料的成分，小明将少量肥料样品带到学校进行探究．

探究内容	现象	结论
实验1：取一定量的肥料放入水中，振荡	样品完全溶解
实验2：取实验1中的部分溶液，滴入石蕊试剂	溶液呈红色
实验3：另取实验1中的部分溶液，滴加氯化钡试剂与稀盐酸	有白色沉淀生成

①小明家的化肥是一种铵盐，有同学认为盐的水溶液都呈中性，你同意他的观点吗？请举例说明．______．

②结合探究过程回答，施用该化肥时应注意______．

答案

通过表格提供的现象结合：①石蕊遇酸会变红 ②硫酸钡是白色沉淀且不溶于酸等知识解决，故答案为：

探究内容	现象	结论
实验1：取一定量的肥料放入水中，振荡	样品完全溶解	易溶于水
实验2：取实验1中的部分溶液，滴入石蕊试剂	溶液呈红色	溶液呈酸性
实验3：另取实验1中的部分溶液，滴加氯化钡试剂与稀盐酸	有白色沉淀生成	该化肥为硫酸铵

①有上述探究内容可知：盐溶液不一定呈中性，故答案为：不同意，例如硫酸铵溶液呈酸性而碳酸钠溶液呈碱性

②铵盐遇碱会放出氨气，使用时应该注意，另由于其呈酸性会使土壤酸化．故答案为：不宜与碱性肥料混合施用，以降低肥效，也不宜长期施用该肥料以使土壤酸化、板结

判断题

班组在实施救助训练时，可由班长组织实施。（）

完形填空

A person should eat right，get some exercise，or he or she will look terrible in 25 years.And if the person drinks and smokes? Even____．That's the message from Blue Cross Blue Shield.The ____，called “Future You”，uses a digital camera and computer to compare a person's current image with his or her future ____ without changes in bad habits.
“Smoking can ___ your skin，” said Anna，a creative operation manager，“You can see what the results of the toxins(毒素) and the chemicals in____are.” Along with the potentially____sight of one's older self，Future You offers sciencebased____on what to eat，how much to exercise and other ways to ____ your health.But will it work? Too ____ to tell was the verdict(意见) of Anna.“I want to see some data！” she said.
Generally，Anna said，men show____concern about their appearance than women.“Women say，‘That looks like my ____on the screen，’” she said.“Men are more likely to ____，‘Yeah，go ahead.Put it on Facebook.’” The project was raised more than a year ago to improve the overall(总体的) health of the people who are ____ of this company.In addition，the growth in the ranks of ____customers would bring down the overall cost of health care.In coming weeks，two new ones will be ___ in locations such as the American Tobacco Campus and the Museum of Natural Science.If users ____，their information will be stored as secrets without names to create a database of good and bad ___．
The process is free and the response is not ____，at least according to Valencia Robertson，one of a line of people who waited to ____ the instrument on Thursday.“I'm good，” Robertson said after ____ her future image.“It's not going to be a big difference.”

C．secretaries

B．thought out