People use more than just words to communicate. In fact, some researchers claim that less than half of a spoken message's real meaning is in the words used in the message. They say that most of a message's meaning comes from understanding how the speaker uses things like tone of voice and body language. Body language includes such things as the expression on the speaker's face, gestures that speaker makes with his or her hands, and the position of the speaker's body. Just as there are many different languages spoken around the world, there are many different ways for people to use body language, too. For example, gestures may imply different meanings in different cultures. Making a "thumbs up" sign in America means, "Great!" However, in Arab cultures, this gesture is extremely offensive. Although many gestures can be interpreted differently by different cultures, there are also many gestures that are almost universally interpreted in the same way. For example, by and large, a smile is understood as a sign of friendship or good will around the world. Also, using an open hand to gesture toward something is viewed as polite or friendly in most cultures. There are also some forms of body language that can be universally read with the meaning, "I am interested in you" or "I like you." Sometimes this kind of body language is used unconsciously between two people. These signs of interest include standing or sitting with both feet flat on the ground, mirroring or using the same gestures as the other person, and turning one's body to fully face the other person. Body language experts point out one important thing. The person's culture is only one factor that can influence his or her use of body language. The time and place where the body language is being used can have a lot to do with a person's body language. If the person has had a bad day or if a meeting takes place in a crowded place, the body language a person uses may be very different from under other circumstances. （1）According to the passage, more than half of a spoken message's real meaning comes from ________.
选项：

A:words used in the message
B:things used in the message
C:the speaker's tone of voice
D:the speaker's tone and body language