This preview shows page 1. Sign up to view the full content.
Unformatted text preview: each winter. Furthermore, they fly to very specific places in South America and will often come back to the same trees in North American yards the following spring. The question is not why they would leave the cold of winter so much as how they find their way around. The question perplexed people for years, until, in the 1950s, a German scientist named Gustave Kramer provided some answers and. in the process, raised new questions.
1. Which of the following can be inferred about bird migration from paragraph 1? ○ Birds will take the most direct migratory route to their new habitat.
○ The purpose of migration is to join with larger groups of birds.
○ Bird migration generally involves moving back and forth between north and south.
○ The destination of birds' migration can change from year to year.
2. The word perplexed in the passage is closest in meaning to ○ d efeated
Paragraph 3在Early in his research, Kramer found that caged migratory birds became very restless at about the time they would normally have begun migration in the wild. Furthermore, he noticed that as they fluttered around in the cage, they often launched themselves in the direction of their normal migratory route. He then set experiments with caged starlings and found that their orientation was. in fact, in the proper igratory up
m direction except when the sky was overcast, at which times there was no clear direction to their restless movements. Kramer surmised, therefore, that they were orienting according to the position of the Sun. To test this idea, he blocked their view of the Sun and used mirrors to change its apparent position. He found that under these circumstances, the birds oriented with respect to the new "Sun." They seemed to be using the Sun as a compass to determine direction. At the time, this idea seemed preposterous How could a bird navigate by the Sun when some of us lose our way with road maps? Obviously, more testing was in order.
3. Which of the sentences below best expresses the essential information in the highlighted sentence in the passage? Incorrect choices change the meaning in important ways or leave out essential information. ○ Experiments revealed that caged starlings displayed a lack of directional sense and restless movements. ○ Experiments revealed that caged starlings were unable to orient themselves in the direction of their normal migratory route. ○ Experiments revealed that the restless movement of caged starlings had no clear direction.
○ Experiments revealed that caged starlings' orientation was accurate unless the weather was overcast.
4. The word preposterous in the passage is closest in meaning to ○ unbelievable
Mail@liuwenyong.com 在在在在在在 www.liuwenyong.com 在在在在在在在在在在在在在在在,在在在在在在在在在在 ○ inadequate
5. According to paragraph 3, why did Kramer use mirrors to change the apparent position...
View Full Document
This note was uploaded on 09/17/2013 for the course LANGUAGE 13DL208 taught by Professor Wang during the Fall '13 term at East China Normal University.
- Fall '13