One morning, I met a customer (顾客) in my shop .He wanted to buy some new clothes. First, I gave him a pair of trousers. He put them on to try, then took them off and gave them back to me and said, “No, give me a coat instead.”

    I gave him a coat and told him, “This one is worth as much as the trousers.” To my surprise, he took the coat without saying a word and walked out of the shop with it .I ran quickly after him and said , “You haven't paid for that coat!”

    “But I gave you the trousers for the coat,” he said. “They are worth the same as the coat, aren't they?”

    “Yes,” I said “But you didn't pay for the trousers, either!”

    “Of course, I didn't!” answered the man. “I did not take them. I am not foolish! Nobody gives things back and then pays for them.”

 根据短文内容判断正误。

两个氢原子____； 氖气____；两个铵根离子____；氧化镁中镁元素的化合价____；氯化钠中的阳离子____．

初中生小航看了“两会”新闻后，自豪地说：“我家二叔作为农民工人大代表到人民大会堂参加会议真光荣！他参与审议了***所作的政府工作报告，并向大会提交了有关保护农民工权益的提案……”小航的这段话说明（  ）

①在我国，人民是国家和社会的主人                         ②人民群众可直接参与管理国家事务

③全国人民代表大会是我国的最高国家权力机关     ④人民代表大会制度是我国的基本政治制度，它有力地保证了人民当家作主