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11.D令1=fm)=gm),则e1=,号+n号=1，m=3+lnt,n=2e寸，即m-n=3+lnt-2e寸，令h(0=3+n1-2e十，则h'()=一2e+(>0),由()=0，得1=号，当0<1 <号时，'()> 0，h()单调通增：当>号时，h'()<0,h()单调递减.h()=h(号)=1-n2,即m一n的最大值为1-ln2.

【答案与解析】本文是一篇说明文。文章主要介绍了发表毕业演讲时应注意的一些事项。36.G根据空前“If you've earned the honor of delivering the class graduation speech,that means you'll be thevoice of your graduating class.It's not only a great fortune but also a huge responsibility..”及下文提到的些注意事项可知，G项“要想成功地发表毕业演讲，你需要记住一些事情”符合。37.E根据空前“..you will tend to speed things up.”及空后“Slow speeches sound really good because theyallow the audience to process what is being said.”可知，E项“然而，好的演讲几乎都是缓慢的，并且充满力量和感情”符合。38.D根据空后“Give the audience time to make sense of what you're saying.Pause after you deliver a reallyheartfelt sentence so that the meaning of the sentence can sink in..”可知，D项“不要害怕在说完一句话后深呼吸一两口气”符合。39.F根据空前“Put feeling into your voice.Don't keep talking in a monotone(单调的)voice for minutes oryou'll put everyone to sleep..”可知，F项“演讲时要带着兴奋的情感，并让你的兴奋渗透到你的声音中”符合。40.A根据空后的内容，尤其是“Believe in your ability to...”可知，A项“要有信心”符合。