题目

阅读理解The best reporters I know are bright, persistent,honest, curious and courageous. If you asked them to explain their success, thisis what they might say: Helen: A good reporter is a generalist, able todeal with a number of topics and talk with a variety of people. He or she can see the unusual, the ironic (讽刺的) in the everyday things. She can think through all the possibilities andorganize a large amount of information to find the important parts. Jack: A good reporter is quick. Once he is assigned a story, he goes after it. He makes the calls and keeps trying if he doesn'tmak下列说法中正确的是(  ) A、碳酸氢钠溶液中:c(Na+)>c(HCO 2-3)>c(CO 2-3)>c(OH-)>c(H2CO3)B、常温下氨水与(NH4)2SO4溶液混合后,若溶液中c(NH4+):c(SO 2-4)=2:1,则该溶液pH=7C、硫酸铜、硫酸铝溶液与硫化钠溶液混合,都会生成氢氧化物沉淀D、配制氯化铁溶液时,往往加入少量稀盐酸,并加入少量铁粉
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