题目

 “青岛世同会”植物馆号称亚洲第一大钢结构馆，拼装钢材杆件达到14000 多根，所有杆件均为现场拼装焊接。     (1)写出T业上用赤铁矿炼铁的化学方程式。     (2)用乙炔氧气焊机焊接钢件时，要先调整乙炔(C2H2)和氧气的比例，氧气不能过量，如果氧气过量，将导致焊接不牢。写出乙炔充分燃烧的化学方程式。     (3)焊接钢材杆件要先除锈。写m用稀盐酸除锈(Fe2O3)的化学方程式。  完形填空（共1小题）阅读下面短文，从短文后各题所给的四个选项（A、B、C 和 D）中，选出可以填入空白处的最佳选项。Most people agree that a pet adds joy to a person's life．Scientists are now finding that having a pet may keep its owner ____．And good health may add years to a person's life.Scientists have been ____ the link between pets and health for years．In 1990, a study was done with people aged 65 and older．It ____ that pet owners went to the doctor less than people ____ pets．Do pets make people ____? Are people able to handle their everyday lives better? Alan Beck, who is a researcher, says that ____ the answer to the questions is yes, then having pets may be a good idea.Can pets also help people live longer? Rebecca Johnson did a study to ____．Johnson teaches nurses how to care for ____ people．Her study shows that having pets may cause people to ____ more slowly.The human body makes many chemicals．Some of the chemicals make people feel ____．Others make people feel bad．In Johnson's ____, levels of the “good” chemicals ____ when people were around pets while levels of the “bad” chemicals went down．The good ____ seemed to slow the aging of cells．If this is __ _, maybe people should spend more time with their ____．Then people might feel better and ____ longer.You might be allergic（过敏的）to pets．Or you may not want to __ __ a pet．Never fear．A robotic, or computer pet may be just the thing for you.Scientists are testing computer pets, like the robotic dog AIBO．They want to see if ____ pets can help people the way ____ dogs do.Will a robotic pet ____ the real pet sitting with you on the sofa? Something tells us that it will probably become a reality.1.A．healthy B．excited C．mad D．hurried2.A．carrying out B．making up C．looking at D．breaking down3.A．warned B．showed C．reminded D．advised4.A．through B．beyond C．against D．without5.A．busier B．funnier C．happier D．angrier6.A．though B．until C．if D．unless7.A．find out B．put out C．turn out D．set out8.A．sick B．friendly C．old D．lovely9.A．age B．move C．walk D．grow10.A．bored B．surprised C．sleepy D．good11.A．study B．work C．story D．case12.A．changed B．varied C．fell D．rose13.A．sides B．chemicals C．studies D．dogs14.A．important B．unusual C．true D．impossible15.A．children B．pets C．friends D．neighbors16.A．live B．wander C．stay D．travel17.A．head for B．search for C．cheer for D．care for18.A．family B．computer C．baby D．toy19.A．brave B．quiet C．faithful D．real20.A．destroy B．replace C．improve D．accompany