英语周报外研版高考20期答案

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

26、(13分)(1)①2HO2=2HO+O2↑(Fe3催化剂)(1分)秒表或计时器(1分)②3(1分)5(1分)(2)微波水热法(1分)Co2+(1分)(3)MnO既作电极材料又有催化作用(只要答出催化作用即给2分,若答出作电极材料而没答催化作用给1分)(2分)BH4+8OH-8c=BO2+6H2O(2分)B(1分)20.4(2分)

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