题目

An eight-year-old child heard her parents talking about her little brother. All she knew was that he was very sick and they had no money. Only a very expensive operation could save him now and there was no one to lend them the money. When she heard her daddy say to her tearful mother, “Only a miracle(奇迹) can save him now,” the little girl went to her bedroom and pulled her money from its hiding place and counted it carefully. She hurried to a drugstore with the money in her hand. “And what do you want?” asked the salesman. “It’s for my little brother,” the girl answere从下列材料中选取必要的信息并进行整合，为“微信”下定义，不超过50个字。（5分） ①微信是腾讯公司推出的一款免费应用软件。 ②微信通过网络为智能手机提供即时通讯服务。 ③微信能快速地为用户提供即时通讯服务，用户可以通过微信与好友进行类似于短信、彩信等方式的联系。  ④微信界面支持发送语音短信、视频、图片（包括表情）和文字，并支持多人群聊和视频聊天