题目内容
营养教育的目的在于提高各类人群对营养与健康的认识，消除或减少不利于健康的膳食营养因素，改善营养状况，预防营养性疾病的发生，提高人们健康水平和生活质量。
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Unit 4 Banked ClozeDirections: In this section, there is a passage with ten blanks. You are required to select one word for each blank from a list of choices given in the word bank. Each choice in the bank is identified by a letter. Please fill in the banks with the letter. You may not use any of the words more than once.In January 2011, Daniel Hernandez saved congresswoman Gabrielle Giffords' life in a mass shooting in Tucson. He kept her alive by 1)______pressure to her wounds and speaking 2)______words of sympathy until medical people arrived. He was 3)______as a hero by the public. Although his devotion to public service is 4)______, in his bookThey Call Me a Hero: A Memoir of My Youth, Hernandez insists that he is not a hero.Hernandez said that he initially resisted the idea of writing a book about his experience on that day of enormous 5)______. "I had been 6)______by a few publishers after the incident," he said. "I thought heroes should be people who make a lifetime 7)______to helping others."However, Hernandez, now a school board member, had come to realize that he would be interested in writing a book 8)______on his public service." As a young official, I've faced some big challenges, and I want young people to know that they need to face challenges and 9)______themselves in their communities."When asked if he had any plan with a second book, Hernandez said his major purpose at present was to continue to serve his community and pursue his passion as a(n) 10)______for education. "But I'm not going to say no," he said.
0.1M H2S溶液中[S2-]的正确表示是
在多元酸溶液中,由于有同离子效应,因而使其第二、第三步的解离度降低。
醋酸的浓度越小，解离度越大，其pH值也越小。
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