If you have dinner with people in the west, I think you must pay more attention to the table manners. Here are some good table manners for you.
     When you eat something, try not to make a noise or burp (打嗝) at the table. Because people think that is not polite. People will say “Excuse me” when they want to burp.
      Talking with food in the mouth is very rude. So you must eat the food quietly and slowly. If you eat too fast, people think you are rude too. Do not talk with others when you have food in your mouth.
      It is good to eat all the food on your plate. This means you like the food very much. Remember to say the food is nice. And this can make the host very happy. When you finish eating, you can place your knife and fork together.

右面漫画《寸步难行》告诉我们（）

①为人处世要讲诚信　　　　　②不讲诚信就是犯罪　

③尊重他人的隐私就是讲诚信　④不讲诚信，害人害己

抽取血液进行化验是医生对患者病情进行诊断的重要依据，下列有关叙述正确的是（  ）

有下列几组物质，请将序号填入下列空格内：

A、CH₂=CH﹣COOH和油酸（C₁₇H₃₃COOH）    B、C₆₀和石墨

C、D、³⁵Cl和³⁷Cl

E、乙醇和乙二醇

①互为同位素的是　 ____　；

②互为同系物的是　 ____　；

③互为同素异形体的是 ____　；

④互为同分异构体的是　 ____　；

⑤既不是同系物，又不是同分异体，也不是同素异形体，但可看成是同一类物质的是 ____