①生活在黄河流域     ②种植水稻     ③住干栏式房子     ④挖井饮水

    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.

比较HIV病毒、大肠杆菌、酵母菌三者之间的关系，下列说法错误的是（　　）