单项选择题
A．The United States. B．Some persons loving birds. C．People who think of the birds. D．Audubon’s future generation.
A．sightseers have noted the changes B．computer-animated views have shown the shrinkage C．one of the glaciers was hit by a ship D．the temperatures are much colder
A．she drives the car more carefully B．she sees the road more clearly C．she can put on the brakes more quickly D．she has less chance of being color blind