根据短文内容，从短文后的选项中选出能填入空白处的最佳选项。选项中有两项为多余选项。
Informal conversation is an important part of any business relationship. 1_____ Latin Americans enjoy
sharing information about their local history, art, and customs. They expect questions about their family
and are sure to show pictures of their children. The French think of conversation as an art form. 2_____
For them, arguments can be interesting-and they can cover pretty much or any topic-as long as they occur
in a respectful and intelligent manner.
In the United States, business people like to discuss a wide range of topics, including opinions about
work, family, hobbies, and politics. 3_____ They do not share much about their thoughts, feelings, or
emotions because they feel that doing so might take away from the harmonious business relationship they're
trying to build. Middle Easterners are also private about their personal lives and family matters. It is considered
rude, for example, to ask a businessman from Saudi Arabia about his wife or children.
4_____ This can get you into trouble, even in the United States, where people hold different views. Sports
is typically a friendly subject in most parts of the world, although be careful not to criticize a national sport.
5_____
A. Instead, be friendly and praise your host's team.
B. You may feel free to ask your Latin American friends similar questions.
C. Before you start a discussion, however, make sure you understand which topics are suitable in a particular
culture.
D. In Japan, China, and Korea, however, people are much more private.
E. In addition, discussing one's salary is usually considered unsuitable.
F. They enjoy the value of lively discussions as well as disagreements.
G. As a general rule, it's best not to talk about politics or religion with your business friends.
，则此时小球对管道的内壁有作用力 
，则小球通过最高点时与管道间有相互作用力