单项选择题
A．They made laws that protect birds. B．They taught young people, helped pass laws that protect animals and so on. C．They tried to make the world better. D．Both B and C.
A．Hurricanes Irene and Floyd B．Hurricanes Floyd and Carla C．an eruption from a volcano D．deforestation of trees
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