英语周报2017～2018答案

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

33.(1)【答案】BCE(5分)【解题思路】气体分子之间的距离很大,分子力近似为零,分子势能也近似为零,气体失去了容器的约束就会散开,是分子无规则运动的结果,A错误;定量100℃的水变成100℃的水蒸气时,吸收热量,内能增加,由于分子平均动能不变,因此分子总势能增加,B正确;气体温度升高,气体分子的平均动能增大,虽然气体分子总数不变,但气体的体积如何变化不确定,所以压强可能增大,可能减小,也可能不变,C正确;土壤里有很多毛细管,如果将地面的土壤锄松,则会破坏毛细管,不能将地下的水分引到地面,D错误;彩色液晶显示器利用了液晶的光学性质具有各向异性的特点,E正确。(2)【关键能力】理解能力和应用物理知识解决实际问题的能力【解题思路】(i)橡皮塞刚好被弹出时瓶内气体的压强P1=P0 △p1=3P0(1分)瓶内气体发生等温变化,由玻意耳定律有p0V0=P1V1(2分)解得fs即瓶内气球外气体体积变为初始时的(2分)i)对气球中的气体,初始时压强和体积分别为P0和橡皮塞刚好被弹出时,气球中气体的压强P2=2p1=V。2V6o,体积V2= -2(1分)此时气球中气体质量与初始时气球中气体质量的比值为"。P22(2分)Po解得—=14(2分)

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