第一节Dear Mr GeorgeI am Li Hua, a volunteer of the activity"Englishi Communication to the Mountains". Now, I'm writing toexpress my sincere apology to you for not being present atthe activity to be held next Monday.The reason for my absence is that I suddenly fell illMy parents sent me to hospital, and I have to stay therefor a week. As for my volunteer work, I have asked myclassmate Tom to do it.Sincerely hoping that you can accept my apologiesYours.Li Hua

15.28【命题意图】本題考查由三视图还原几何体的直观图、几何体外接球的表面积的求解,体现了直观想象、数学运算等核心素养【解析】由三视图可知,该几何体是一个正四棱柱截去一个三棱锥后剩下的几何体,其示意图如图.由几何体的体积为20cm3,得4a2-xa2×4=20解得a2=6.因为正四棱柱的体对角线即为其外接球的直径,所以该几何体外接球的表面积S=T(6+6+42)=28m(cm2)

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