关于氢气的物理性质，下列叙述不正确的是（　　）

将下列句子组合成语意连贯、合乎逻辑的一段话，并将序号填入横线处。

铅色水鸫的行为最具代表性。它常守候在溪面凹凸不动的岩石上，然后沿着岩石群逐一跳跃，捕捉溪水附近肉眼难见的蜉蝣与蚊蚋科小虫。溪涧的天地小溪鸟的领域感自然十分强烈，铅色水鸫更是如此。____，____，____，

____，____，____。一山不容二鸟，两者之间势必起冲突。我都未看见小剪尾打赢过铅色水鸫。 

①它的体积约摸麻雀大，攻击性却勇猛凶悍

②究其原因，原来它的习性类似铅色水鸫

③日后我也发现只有小剪尾独独会遭受铅色水鸫的排斥

④不但觅寻的主食来源一样，体积也相似，而且活动的位置都是岩石滩

⑤在溪涧王国里，这种场面算是最激烈的争斗

⑥我经常看见大它半倍的小剪尾遭到驱逐，落荒而飞

   Mr. and Mrs. Clark are 70 years old. They look young and they are very healthy. Why? Let me tell you. That’s because they have a healthy lifestyle.
   They exercise every day, and every morning they exercise in the park. After that they usually go to the supermarket. They walk there for about half an hour. They don’t take buses. Because they think walking is good for their health. They often take a walk after dinner.
They also have a good eating habit. They drink milk every morning. They eat fruit and vegetables every day. As for meat, they only eat it twice a week. Besides (除…之外) that, they never eat junk food. They don’t drink coffee or cola at all. You see, they look after their health very well.
   Mrs. Clark likes watching soap operas and reading books. She reads books every day. Mr. Clark likes Chinese paintings. They usually go to bed at 9:00 pm and sleep for eight hours every night.