阅读下面的文章，完成后面的题。
                                                                                                                 礼   物
                                                                                                                   柴静
         ①那是个夏天。晚上上班的路上，细细碎碎地下起了雨，等到深夜下了节目，雨已经大了。匆忙下了楼向右拐时，忽然有个人迎上来，犹疑地叫我的名字。我怔了一下，借着一线灯光看见他身着军装，才安下心来。他那么大的个子，脸却很稚气，期期艾艾地说他是国防科大的学生，就要毕业了，来看看我是他几年来的心愿。我一时也不知该说些什么，只将手里的伞移过去给他遮雨，他马上后退了几步：“不不，不用，我走了。”
        ②我看他的身影消失在漆黑的雨夜里，转身欲走，他气喘吁吁又跑回来，脸涨得通红，从裤兜里掏出一个火柴盒交给我，并拢双脚刷地敬了一个军礼，转身走了。
        ③那只火柴盒里装的是一只小乌龟，硬壳绿背的巴西水龟，我在透明的大啤酒杯里养了它很久。那年冬天很冷，小龟贪恋人的温暖，每每要伏在我掌心才肯蜷起四肢沉沉睡去，这是我收到的最可爱的礼物。 
         ④春节回家过年时，同事转寄给我一封信，信是从西藏寄来的。我在炉火边拆开细读，信中写道：“那天夜里你没有问我毕业后去哪里，我也没有告诉你，我选择的是遥远的雪域高原。这里人迹罕至，十分寒冷。有一夜出去巡哨，看着月光下连绵起伏的雪峰，我忽然明白了为什么你在节目里说，‘人的存在犹如电光石火’。”
         ⑤远处忽然传来鞭炮的脆响，我顿了顿，继续看下去，“但在这个世界上还是有很多东西值得用生命去护卫……那只小龟可好？它很怕冷，所以我把它留给你。它是去年我生日那天路过教育街市场时捡到的，也是同一天，我在收音机里听到了你的节目。我一直认为，这都是上天送给我的礼物。”膝边的炉火渐渐升起来，给严寒的世界增添了一点暖意。水仙已经开了两朵，满室清香。
                                                                                                                                                                         ——选自柴静《用我一辈子去忘记》
      【注】柴静：中国中央电视台新闻频道记者、主持人。

    Researchers at Stanford University have developed a new material that can move heat out of buildings and into space. The researchers say the material can cool buildings even on hot days. The cooling material is a very thin sheet with many layers that could be placed on a roof like solar panels(板). However, instead of turning sunlight into energy as solar panels do, the material turns heat into infrared（红外线的）radiation.

    Shanhui Fan is an electrical engineering professor at Stanford University. He says that the panels have a layer of material that is like sand. The panels act like a mirror. They take heat out of buildings and reflect the light from the sun. And he says both the heat and sunlight arc sent 100 kilometers into outer space. "It's a structure that cools itself without electricity input, even under the sun. So, what it does is basically radiate heat to outer space and also reflect the sunlight so it doesn't get heated up by the sun. Mr. Fan says it is like having a window into space. The heat is sent directly into space without increasing the air temperature

    He says buildings in developing countries that do not have electricity or air conditioning could use the panels. "In areas where electricity is out of reach for many people, there is a potential benefit for storing medicine or even food. In many of these situations, being able to reduce the temperature is important. And this would provide a way to do it.”

    The researchers say the main problem is creating actual cooling systems using the high-tech panels. They say it may be possible to develop a cooling spray(喷涂）that could be used on present solid structures. They believe the cooling spray technology could be developed in the next three to five years. They say as much as 15 percent of the energy used in the United States is spent providing power to air conditioning systems.

2015年11月2日，中共中央、国务院办公厅印发了《深化农村改革综合性实施方案》，聚焦农村集体产权制度改革。从唯物史观角度看，农村集体产权制度改革是（　　）