为了吸引外资，发展中国家改善投资环境，目的主要是为了（　）

写出近义词

尽—____    休—____    熏—____

    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.

①它的中心C处是洛阳

②它沟通了我国南北交通

③它促进了我国南北经济的交流

④它有效抵御了北方游牧民族的进攻