2014年云南成人学位英语模拟试题及答案五
Part II Reading Comprehension (40 points)
Directions: There are 4 passages in this part. Each of the passages is followed by 5 questions or unfinished statements. For each of them there are 4 choices marked A, B, C and D. Choose the best one and mark your answer on the ANSWER SHEET with a single line through the center.
Passage One
Why don’t birds get lost on their long migratory flights? Scientists have puzzled over this question for many years. Now they’re beginning to fill in the blanks.
Not long ago, experiments showed that birds rely on the sun to guide them during daylight hours. But what about birds that fly mainly by night? Tests with artificial stars have proved conclusively that certain night-flying birds are able to follow the stars in their long-distance flights.
One such bird—a warbler (鸣禽)—had spent its lifetime in a cage and had never flown under a natural sky. Yet it showed an inborn ability to use the stars for guidance. The bird’s cage was placed under an artificial star-filled sky at migration time. The bird tried to fly in the same direction as that taken by his outdoor cousins. Any change in the position of the make-believe stars caused a change in the direction of his flight,
Scientists think that warblers, when flying in dayflight, use the sun for guidance. But the stars are apparently their chief means of direction-finding. What do they do when the stars are hidden by clouds? Apparently they find their way by such landmarks as mountain ranges, coast line, and river courses. But when it’s too dark to see these, the warblers circle helplessly, unable to get their directions.
16. The reasons why birds don’t get lost on migratory flights _____.
A. are known to everyone
B. will probably remain unknown
C. have been discovered only recently
D. have been known to scientists for years
17. Birds that fly mainly at night follow _____.
A. the stars
B. the moon
C. artificial stars
D. the natural sky
18. The experiment with the warbler indicated that ______.
A. some birds cannot fly at night
B. birds have to be taught to find directions
C. a bird that has been caged will not migrate
D. some birds can follow the stars when flying at night
19. Warblers migrate ______.
A. only once during their lifetime
B. when they are freed from their cages
C. using what is apparently an inborn ability
D. only with the guidance of his outdoor cousins
20. When the stars are hidden by clouds, ______.
A. warblers circle helplessly
B. warblers rely on landmarks
C. warblers can’t see mountain ranges
D. warblers are unable to get their directions
责编：cll