英语周报七年级上册2022一2022学年第25期答案

11.A饱和Na2CO3溶液与BaSO4固体反应:CO-+BaSO一BaCO3+SO-,符合客观事实,电荷守恒,原子守恒,A正确;室温下用浓HNO3溶解铜:Cu+2NO+4H=Cu2+2NOh2↑+2H2O,B错误;向次氯酸钠溶液中通入足量SO气体,发生氧化还原反应:Cl0-+SO2+H2O=C1-+SO-+2H,C错误;向碳酸氢铵溶液中加入足量澄清石灰水:NH+HCO+Ca2++2OH一CaCO2↓+H2O+NH3·H2O,D错误

第二节One possible versionDear mr. smithIm writing to ask for a three-day leave, for I can'Iattend your English classes from Monday to Wednesday nexOwing to a severe headache, I have made an appoint-ment with a specialist. and my mother will take me to seehim. It's a great pity that I will miss your interesting lessons but I hope you will excuse my absence. I promise tomake up for the missed lessons after I return to school.Your kind permission will be greatly appreciatedYeLi Hua

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