[originaltext] We use both words and gestures to express our feeling, but th

We use both words and gestures to express our feeling, but the problem is that these words and gestures can be understood in different ways.
    It is true that a smile means the same thing in any language. So does laughter or crying. There are also a number of striking similarities in the way different animals show the same feeling. Dogs, tigers, and humans, for example, often show their teeth when they are angry. This is probably because they are born with those behavior patterns.
    Fear is another emotion that is shown in much the same way all over the world. In Chinese and in English literature, a phrase like "he went pale and began to tremble" suggests that the man is either very afraid or he has just got a very big shock. However, "he opened his eyes wide" is used to suggest anger in Chinese whereas in English it means surprise.
    Even in the same culture, people differ in their ability to understand and express feelings. Experiments in America have shown that women are usually better than men at recognizing fear, anger, love and happiness on people’ s faces. Other studies show that older people usually find it easier to recognize or understand body language than younger people do.
Questions 16 to 18 are based on the passage you have just heard.
16. What’s the main idea of this passage?
17. What does the expression "he opened his eyes wide" mean in English?
18. Who can better understand body language?