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

6.D【解析】本题考查函数的性质,考查运算求解能力由题知,f(x)+f(-x)=0对任意的实数x成立,即ln(√ax2+1+2x)+ln(√ax+1-2x)=hn(ax2+1-4x2)=0对任意实数x成立,所以ax2=4x2对任意实数x成立,从而可知a=4.

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