Birds are becoming popular as pets. But some owners of birds don't know how to communicate with their pets. Therefore, they don't know what their pets need or want. Owners can learn how to read the body language of a bird, including movements of the wings, the tail and the beak(喙).
Wings
A bird can communicate with others through the use of its wings. A bird may lift or open its wings as a sign of happiness. But if the bird starts to open and to close its wings, it may express anger or pain. If a bird fails to fold its wings against its body, and instead lets them hang by its side, it may be ill.
Tail
Birds often use their tail feathers to communicate, so an understanding of this behavior will help the owners. Happiness is expressed by tail movements, such as up and down. However, if a bird fans its tail feathers out, it is usually a way to show anger.
Beak
While a bird's beak is used mainly for eating, the bird may also communicate by using beak movements. For example, a bird may click its beak once as a greeting, and several clicks can be taken as a warning. Birds may sometimes bite, but it is often difficult to find out the reason behind this — birds bite as a way to protect their homes, to show anger or to express fear.
阅读下面短文，按照句子结构的语法性和上下文连贯的要求，在空格处填入一个适当的词或者使用括号中词语的正确形式填空。
In the tenth grade, I worked at an animal hospital in my spare time. I wanted to get experience for my future job. However, I (get) something more important.
The hospital (lie) in a poor place of the city. One Saturday, a man and his little son walked in and opened a box (careful). There was a cat in the box, and something was wrong the cat's left eye. But the man didn't have enough money to pay for the medicine. He kept quiet for a while, and then he asked where (near) animal shelter was. Hearing this, his son(cry). At that time, an old woman walked up to them and told the man that she would pay for the medicine. The man thanked her and the son got to keep a (health) cat.
I always thought it was the right thing to help a person was in trouble, but I only saw that TV or in movies before. What the woman did made me believe that these things did happen in real life. Now, when I can't decide whether to help someone in need 30. not, I think of this woman, and then I have the courage to do it.
（1）不要抱怨麻烦，你应该想出办法解决它。
Don't the trouble. You should a way to solve it.
（2）根据报告来看，学校里有近三分之一的学生近视。
the report, almost one third of the students in the school are near-sighted.
（3）一些不幸的人有先天性心脏病，我们应该帮助他们。
Some unlucky people were born with a . We should help them.
（4）你应该记住它，更重要的是，应该好好理解它。
You should remember it, and , you should understand it well.
