What does the professor mean where says this: A: Results are tragic when airplanes strike birds. B: Sightings of birds from aircraft are unusual. C: Airplanes do not frighten away most birds. D: There is little similarity between birds and jets.

那里的森林里曾有许多奇异的植物、兽类和鸟类。英译此句以下哪些选项是准确的？ A: There were once many strange plants, unfamiliar animals and birds in the forest there. B: Many strange plants, unfamiliar animals and birds once dwelt the forest there. C: The forest there was once inhabited by many strange plants, unfamiliar animals and birds. D: The forest possesses many strange plants, unfamiliar animals and birds.

Off flew the birds.

Why did one scientist expose birds to artificial daylight（） A: To test the relationship between daylight and a disease of the glands common to birds. B: To test the relationship between daylight and migration. C: To test the relationship between migration and temperature. D: To test the relationship between daylight and changes in the season.

In Chapter IV, the author would like to give you information about ______. A: how to attract birds B: seasonal flights of birds C: language of birds

One of Tony’s hobbies was to (collection) rare birds.

It is a lucky sign to see or hear songbirds or yellow-colored birds.

The investigation ________ evidence of a large-scale illegal trade in wild birds.

Coronaviruses are a large family of viruses that cause disease in humans and birds.

This passage supports the belief that ______. A: exact reasons for migration are not known B: glaciers caused birds to migrate C: the ancestral home of birds was the tropics D: birds migrate because of changes in temperature