阅读下面一则消息，概括其核心内容，要求不超过30字。

******近日出访拉美时，国礼名单中有一套DVD光盘受到了人们的广泛关注。其中包括赵宝刚执导的两部作品《北京青年》、《老有所依》和滕华涛执导的《失恋33天》。这三部作品均以当下中国城市普通百姓的日常生活和共同际遇为题材。它们或许未必体现中国当代影视制作的最高水平，却具有典型性和代表性。既体现了当今国与国之间交往的新趋势，更体现了新时期中国主动塑造国家形象的深刻用意。

送国礼首先要考虑是否具有本民族特色。像泰国等佛教国家，常常采用一些以佛教为题材的礼品；欧洲的一些国家，比如捷克的玻璃制造业非常发达，就会拿玻璃制品当国礼送。从新中国成立至今，我国送出去的国礼数不胜数、各有特色。外交部礼宾司前参赞吴德广说：“雕漆、景泰蓝、木雕、丝织、刺绣、湘绣等，经常作为我国的国礼。”

事实上，现实题材影视剧首次成为“国礼”，不仅使长期以丝绸、瓷器、绘画等艺术品作为主打内容的“国礼”显得更具时代感，也为外国友人打开了一个了解中国的窗口。文化软实力的输出对于中国塑造更加可亲的国际形象有着更为强大的推动作用。（人民网）

    China, which boasts epochal (划时代的) inventions in ancient times, has once again proved its ability____ (change) the world with its “new four great inventions”: high-speed railways, electronic payments, shared bicycles and online shopping. The new four great inventions are all related to China's high-tech innovation, which improved the quality of people's lives.

My wallet is no longer in use. I can buy and eat whatever I want ____ (simple) with a tap of my phone, and even pancake sellers are using Alipay ( mobile payment).

    The bikes ____ (them) are not new, but the operating model of bike-sharing ____ (base) on satellite navigation (导航) system, mobile payment, big data and other high technologies. Shared bikes are bringing cycling back____people's lives... and they are making public transport more attractive and convenient, and ____ (encourage) people to be more active.

    It is increasingly clear that China is innovating (创新) and no longer copying western ideas. It is increasingly clear that China is leading in many ____ (way) such as social messaging app WeChat. This is partly____China skipped over the PC era-and went directly to mobile. China has the largest mobile use in the world.

    ____ growing number of foreigners hope to promote economic ____ ( develop) in their home countries by highlighting (聚焦) the need for technological achievements like that of China.

若直角坐标平面内的两点P、Q满足条件：

①P、Q都在函数y=f（x）的图象上；

②P、Q关于原点对称，则称点对P，Q是函数y=f（x）的一对“友好点对”（点对P，Q与Q，P看作同一对“友好点对”），

已知函数f（x）=$\left\{\begin{array}{c}{\log }_{2}x\left(x>0\right)\\ -x^2-4x\left(x\le 0\right)\end{array}\right.$，则此函数的“友好点对”有（　　） 

中国在1952年成立“国家计划委员会”，1998年更名为“国家发展计划委员会”，2003年将原国务院体改办和国家经贸委部分职能并入，改组为“国家发展和改革委员会”。这一机构名称的变化反映出中国