题目

某同学采用硫铁矿焙烧取硫后的烧渣(主要成分为Fe2O3、SiO2、Al2O3 ， 不考虑其他杂质)制取七水合硫酸亚铁(FeSO4·7H2O)，设计了如下流程：下列说法错误的是（） A . 溶解烧渣选用足量硫酸，试剂X选用铁粉 B . 固体1中一定含有SiO2 ， 控制pH是为了使Al3+转化为Al(OH)3 ， 进入固体2 C . 从溶液2得到FeSO4·7H2O产品的过程中，须控制条件防止其氧化和分解 D . 若改变方案，在溶液1中直接加NaOH至过量，得到的沉淀用硫酸溶解，其溶液经结晶分离也可得到FeSO4·7H2O完形填空阅读下面短文，掌握其大意，然后从1-20各题所给的四个选项（A、B、C和D）中，选出最佳选项。It was 4 o'clock in the morning, when I received the phone call．“This is the emergency room calling and your son was just ______ in with severe burns on his face, neck and arms. We have called for a(n) ______ and are going to fly him to the burn unit in Seattle.” Seattle was 350 miles from his college, so we knew immediately this was ______.The doctor described the ______, which caused the burns. At 6 am, our son and his friends decided to barbecue hamburgers in the courtyard of their apartment. When they ______ the charcoal(木炭), it burst into flames because they had sprayed too much gasoline. The flames ______ my son’s shirt tail and shot from his waist to well over his head.______, one of the boys who was quick—minded grasped my son and ______ him on the grass. While it saved his life, it was not in ______ to save him from severe burns and the terrible scars.After he ______ from the treatments, the doctors told him they would not do plastic surgery(整容)for 6 months ______ it takes that long for the skin to stop wrinkling(起皱). So, he had to return to college with scars typical of severe burns．When I was a child, my mother told my sister，who had a 10-inch very ______ scar on her arm, “Nancy，if you ignore the scar，other people will ignore it. It does not mean they will not ______ it, but it means it will not matter to them if it doesn’t matter to you. ’’I ______ this wisdom on to my son. He took my advice to _____ and returned to school with his head held high—glad he was alive.By the end of the six-month waiting period, he decided that the scars did not ______. So he made the ______ to give up any plastic surgery.We all have “scars” that we believe ______ people to keep away from us. And we spend a lot of time thinking that if only we looked differently, or dressed differently, people would like us better. But you see, people will only judge you by your looks or your clothes if you are judging yourself by these same ______ standards. Put your imperfections out of your mind and concentrate on what you value ______ yourself, and your beauty will shine through.1.A. brought B. given C. turned D. showed2.A. doctor B. hospital C. aircraft D. ambulance3.A. serious B. terrible C. dangerous D. important4.A. event B. process C. reason D. accident5.A. got B. lit C. burned D. moved6.A. took B. held C. caught D. attracted7.A. Fortunately B. Surprisingly C. Happily D. Slowly8.A. pushed B. threw C. dropped D. rolled9.A.shape B. place C. fact D. time10.A. benefited B. recovered C. suffered D. relaxed11.A. if B. while C. because D. although12.A. normal B. violent C. obvious D. popular13.A. mention B. notice C. 1augh D. hide14.A. sent B. kept C. handed D. passed15.A. heart B. life C. practice D. admission16.A. grow B. matter C. exist D. appear17.A. mistake B. effort C. decision D. request18.A. invite B. cause C. allow D. remind19.A. false B. strict C. moral D. general20.A. by B. over C. beyond D. within