It is important to know another language and how to communicate without words when you are in another country. Before saying anything, people communicate with each other by using gestures . However, many gestures have different meanings, or no meaning at all, in different parts of the world. In the United States, nodding your head up and down means "yes", while in some pats of Greece and Turkey, it means "no". In the southeast of Asia, it is a polite way of saying "I heard you".  Today in the USA, when someone puts his thumb up, it means "Everything is all right." However, in Greece it is bad. Also putting your clasped hands up above your head means "I am the winner." It is the sign which players often make. In Russia it is the sign of friendship. In the USA, holding your hand up with the thumb and index finger , and the other three straight means "Everything is OK." In France, it means "You are worth nothing." It is also important to make eye communication. If you look down when talking to an American, he or she may feel that you are shy, or you are trying to hide something. Besides these, you should also know there are some topics that can not be talked about, such as age, weight and marriage. You can talk about the weather, work, sports, food, where one lives and news of the day. The main idea of the passage is that when you are in another country,   _  .
it is important to know the language. .it is important to know what you talk about to a foreigner. to know how to communicate without words is as important as to know the language. to communicate through gestures is more important than to know the language.
Question: It is important to know another language and how to communicate without words when you are in another country. Before saying anything, people communicate with each other by using gestures . However, many gestures have different meanings, or no meaning at all, in different parts of the world. In the United States, nodding your head up and down means "yes", while in some pats of Greece and Turkey, it means "no". In the southeast of Asia, it is a polite way of saying "I heard you".  Today in the USA, when someone puts his thumb up, it means "Everything is all right." However, in Greece it is bad. Also putting your clasped hands up above your head means "I am the winner." It is the sign which players often make. In Russia it is the sign of friendship. In the USA, holding your hand up with the thumb and index finger , and the other three straight means "Everything is OK." In France, it means "You are worth nothing." It is also important to make eye communication. If you look down when talking to an American, he or she may feel that you are shy, or you are trying to hide something. Besides these, you should also know there are some topics that can not be talked about, such as age, weight and marriage. You can talk about the weather, work, sports, food, where one lives and news of the day. The main idea of the passage is that when you are in another country,   _  .
A. it is important to know the language.
B. .it is important to know what you talk about to a foreigner.
C. to know how to communicate without words is as important as to know the language.
D. to communicate through gestures is more important than to know the language.
Answer: