每年夏季都会发生溺水事件，当你遇到有人因溺水停止呼吸时，正确的急救措施及顺序是（　　）

①仰卧平躺    ②打“120”急救电话   ③口对口吹气  ④清除口、鼻内异物和污物．

①微博议政开辟了公民行使民主权利的新途径

②微博议政说明了公民参政议政意识的增强

③只有网络才能搜集到真实的社情民意

④微博议政有利于公民直接参与国家事务的决策

根据短文理解，选择正确答案。

    Do you want to be a reporter? Are you a good English writer who loves the news? We're looking for 100 students from all over the world. They will join the BBC Kid Reporter team for the 2016－2017 school year.

    In the past, BBC Kid Reporters:

★Interviewed (采访) some famous people.

★Wrote news stories for BBC For Kids.

★Talked about their work on television.

Next year our team will go on to report local news stories for BBC For Kids magazine (杂志) and bbcforkids.com.

How to Enter

    Visit www. bbcforkids.com and fill in the entry form (报名表). Be sure to read the rules and share them with your parents, who must sign your form. You must finish the form by July 9, 2016. You must be OVER 13 years of age. Good luck!

人们常说的“五金”是指“金、银、铜、铁、锌”，根据所学知识判断，不能与盐酸反应的金属是____（填名称）。世界上常用黄金作金融储备、货币等，其原因是____。黄铜是铜锌合金，其硬度比纯铜____（填“大”、“小”或“相同”）。