下列各组图形有可能不相似的是(    )

在中国古代“家国一体”的社会中，忠孝观念源远流长，其源头是（  ）

如图表示某些物质间转化关系．A、D为固体且组成元素相同，A为紫黑色；X、F为液体且组成元素相同，X具有消毒杀菌作用；E为产生温室效应的常见气体，Y是一种红色的金属．请回答下列问题：

（1）D的化学式____，F的化学式____；
（2）写出有关反应的化学方程式：②____；⑤____．
（3）利用合成气在一定条件下可合成化工产品乙醇（C₂H₆O），请写出该化学反应方程式____； 结合反应②⑥，可看出CH₄不仅可作燃料，而且是重要的____原料．

      Nancy and Sheila are in the same class. They are friends. Nancy wants to invite Sheila to dinner on Sunday. But Sheila doesn't know the way. Now Nancy is telling her.

"It's easy. You can take No. 4 bus. After you get off at Red Road. cross it and take the first turning on the left. Walk along the road for about five minutes. and then you'll see a big tree. Go straight on for about a hundred meters. and you will see a big red house. This is not my home. Go past the big house about four hundred meters. and you'll see a small yellow house beside a little tree. Then you can open the door with your foot."0

    "With my foot?" asks Sheila. "Why?"

    "Well. you won't come to my house empty-handed(空手地)， will you?"  answers Nancy.