单项选择题
A．he can see the difference between red and deep red B．he can see the difference between blue and green C．he can't tell the difference between orange and green D．he thinks green is the same as blue
A．birds are important in our lives B．animals are important in our lives C．nature is important in our lives D．Audubon was especially interested in birds
A．was not famous 130 years ago B．is still famous now C．was famous 200 years ago D．is not famous now