理想是人生奋斗的目标，下列关于理想正确的讲法有(   )
①理想给人生以方向，能鼓舞斗志，助人成功 ②理想的实现是一个长期过程，需持之以恒 ③理想信念形成后，具有稳定性，不因环境条件改变而改变 ④当代中国，只有把个人理想融入共同理想之中，才能更好实现人生价值

小明是个很善于把物理知识应用于实际的同学，最近他家中新安装了天然气热水器，如图所示，小明仔细观察了包装箱、热水器铭牌，获得了以下信息：①包装箱及热水器的总质量为16kg；②“堆积码层数极限”标志数为11，即该包装箱在仓储时从地面开始，平放时最大堆放层数是11层，超过则可能把最底层的包装箱压坏；③根据包装箱尺寸计算出平放时的底面积为0.4m²；④热效率为87%．表示该热水器工作时，天然气完全燃烧所消耗的化学能，有87%的转化为水的内能；⑤加热模式为“即热式”，即用热水器给水加热时，只要接通开关让自来水流过热水器，流出的水即可达到设定的水温．

小明想估测该热水器的实际热效率，以核对铭牌上的数值是否准确．他接通热水器工作开关，当流出40kg热水时，让热水器停止工作．已知当自来水的温度是15℃，热水器输出的热水温度为40℃，观察天然气表得知共用了0.15m³的天然气．天然气的热值为3.2×10⁷J/m³，水的比热容4.2×10³J/（kg•℃），g取10N/kg．请帮小明解答下列问题：

下面不正确的是（   ）

An Englishman was showing a foreign visitor around London. "What's that strange building?" asked the visitor. "That's the Tower of London." "I see. How long did it take to build it?" "About 500 years." "In my country we can build it in five months." said the visitor. A short time after that, they come to St. Paul's Cathedral (大教堂)."Very interesting, "said the visitor, "How long did it take to build it?  Nearly forty years." said the Englishman. "In my country we can finish it in forty days." said the visitor. This went on all day. They visited most of the best known buildings in the city. Every time they saw a new one, the visitor asked what it was and how long it took to build it. Then he said that they could do the same things much faster in his country. At last the Englishman got angry with the visitor though he tried not to show it. A few days later they came to the House of Parliament(议会大厦) and the visitor asked his usual question. "What's that?" The Englishman answered, "I've no idea. It wasn't there last night."