1. What is the lecture mainly about?
- A. A method that is used to determine an animal’s diet
- B. How scientists determine where migratory birds stop to feed
- C. Two different forms of carbon that can be found in animals
- D. How migratory birds find different types of food at stopover sites
2. How did researchers find out what a bird ate at different times during migration?
- A. By faking samples of the bird’s breath at different places on the migration route
- B. By taking the bird wear a device that records what it eats during its journey
- C. By taking samples of the bird’s breath and several of its body tissues
- D. By observing bird feeders along the migration route
3. According to the professor, what are two possible reasons that white-throated sparrows eat corn on Block Island?
- A. The birds normally eat corn throughout the year.
- B. The berries that they usually eat are not available.
- C. The corn provides good nutrition for long flights.
- D. The birds can easily locate corn growing on farms.
4. According to the professor, what might be the practical application of studying the diet of white- throated sparrows?
- A. It will help Block Island farmers prefect their crops.
- B. New methods of determining changes in diet can be developed.
- C. Feeding white-throated sparrows will prevent them from migrating in the winter.
- D. Migrating white-throated sparrows will be provided with the most appropriate diet.
5. What do biologists hope to find out by using breath collectors on bears?
- A. Whether the diet of bears changes when they are nursing
- B. How the amount of meat in the diet of bears affects their health
- C. How the bears’ ability to nurse their young varies
- D. Whether the diet of bears affects the carbon signature in their blood
6. Why does the professor say this: 【音频缺失】
- A. To indicate that she would enjoy doing this type of research with bears
- B. To indicate that this type of research is easier to do with birds than with bears
- C. To encourage students to volunteer for research projects
- D. To encourage students to express their opinions