( ) 31. What does Paragraph 2 mainly talk about?
A. Why swifts' wings are like boomerangs. B. How swifts catch insects in the sky. C. How swifts make sharp turns in the sky. D. How swifts fly and turn fast in the sky.
( ) 32. What does the underlined word "It" refer to in Paragraph 3?
A. The saliva. B. The air. C. The shape. D. The speed.
( ) 33. Which of the following is true about swifts?
A. They don't usually live on land because of wings. B. They can fly for a long time because of their small bodies. C. They can't walk for a long time because of their short feet. D. They can catch nearly 1,000 insects in one go with the saliva.
( ) 34. What is the use of the swifts' saliva?
A. It helps the swifts walk on land for long. B. It is used to help build strong nests. C. It helps the swifts fly faster in the open air. D. It is used to help keep the insects away.
( ) 35. Which of the following is the best title for the passage?
A. The sky-living master B. The amazing small pet C. The fastest speed D. The special saliva