A. PROFESSOR B. DETERMINE C. APPEARANCE D. INSTITUTEREAD THE PASSA...

5. A. professor B. determine C. appearance D. instituteRead the passage carefully and choose the correct answerPeople 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 see information. Theirsongs 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 arelooking for a wife.Birds also sing too tell other to keep away. To a bird, his tree or even a branch of tree is his home. He does not want strangers to comenear him, so he sings to warn them.If a bird can not sing, he usually has come other means of giving information. Some birds dance, spread out their tails or make other signs.One bird has a most unusual way finding a wife. It builds a small garden of shell and flowers.