5.A【试题情境】本题是应用性、创新性题目,属于生活实践情境【关键能力】本題考查逻辑思维能力和创新能力【解题思路】由题一→∫f(0)=1f(1)=25·b=2,k=-1-→f(x)10f(3)=75<8,f(4)=9>8f(x)在[0,十∞)上单调递增解【解析】由题可得f(0)=1,则解得b=2,k=-1,所由函数解析式可知,f(x)在[0,+∞)上单调递增,(3)=13=24=758/(4)=10=9>8,故该果树的高度超过8m,至少需要4年.故选A

To my surprise, the guard immediately recognized the wallet. He said it must be MrGoldstein's, who had always lost that wallet. The guard had found it in the halls at least threetimes. When I asked who Mr Goldstein was, the guard said he was one of the old men on theeighth floor and that was his wallet for sure. Then we went back to the elevator and got to theeighth floor. In the day room, we found Mr. Goldstein and told him I had found his walletI handed the old man the wallet, I said, "Mr. Goldstein, I have to tell you something.Iread the letter inside, and I think I know where Hannah is. " The old man grabbed my handand said, "Could you tell me where she is? I missed her so much. I never married. I guess I'vealways loved her. " We took Michael to the third floor, where Michael and Hannah recognizedeach other and they embraced. The nurse and I left with tears streaming down our faces. Isn'tit a perfect ending for a love affair that had lasted nearly sixty years

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