Read the passage and make the correct choice.
People usually sing because they like music or because they feel happy. They express their happiness by singing. When a bird sings, however, its song usually means much more than that the bird is happy. Birds have many reasons for singing. They sing to give information. Their songs are their language. The most beautiful songs are sung by male birds. They sing when they want to attract a female bird. It is their way of saying that they are looking for a wife. Birds also sing to tell other birds to keep away. To a bird, his tree or even a branch of a tree is his home. He does not want strangers to come near him, so he sings to warn them. If a bird cannot sing well, he usually has some other means of giving important information. Some birds dance, spread out their tails or make other signs.
36. People sing because _____________________.
A. they know many songs. B. they are good at singing
C. they want to tell a story. D. they feel happy.
37. What is one of the main reasons why birds sing?
A. They are sad B. They can sing many songs.
C. They are in a bad temper. D. They want to give information.
38. Which birds sing the most beautiful songs?
A. Female birds which attract male birds. B. Male birds
C. Female birds D. Young birds which attract male birds
39. According to the passage, a bird sings _____________________.
A. to stop sadness. B. to tell other birds to come quickly.
C. to warn about the approach of people. D. to tell strangers to keep away.
40. Most birds usually _______________ if they cannot sing well.
A. flies in the sky B. find a wife
C. give information in another way D. warn other birds to go away
