题目

阅读下面的短文，然后按照要求写一篇150词左右的英语短文。 Dear Ms Jordan,  I am sorry for misbehaving in class .I won't do it again.                                                Tyler Vincent Turner This is a letter of apology that my six-year-old son Tyler wrote to his teacher .It was simple enough and took less than five minutes to write, but I hoped the message I was sending to Tyler was one that would have a lasting effect. When I made the decision, I hoped it was the right thing to do .It turned out that Ms Jordan w设NA为阿伏加德罗常数，下列叙述正确的是（    ） ①7Li+中含有的中子数与电子数之比为2：1 ②Cl2的摩尔质量与NA个Cl2分子的质量在数值和单位上都相等 ③常温下，11.2L的甲烷气体中含有的氢、碳原子数之比为4：1 ④活泼金属从盐酸中置换出1molH2，转移电子数为NA ⑤在C2H6分子中极性共价键与非极性共价键数之比为3：1 ⑥500mL0.5mol·L-1Al2(SO4)3溶液中，含SO42-数目为0.75NA ⑦5.6g铁与足量的氯气反应失去的电子与参与反应的铁的物质的量之比为2：1 ⑧常温常压下，0.5 NA个一氧化碳分子所占体积是11.2L A．①②⑤     B．②③⑧     C．①③⑥     D．③④⑦