听力原文：

When you learn a foreign language, you must learn more than the vocabulary and the grammar. To communicate successfully, the grammar and words are not enough. You must also learn the body language called mankind’s second language. Body language is a term used to describe facial expressions, gestures, and other movements of the body that send messages. Body language is an important medium for people to communicate with each other. This means of communication is so important that we may actually say more with our movements than with words.

Question: Which language is called mankind’s second language?

参考答案：

Body language is called mankind’s second language.