IT IS MENTIONED IN THE PASSAGE THAT IF THE GLOBAL TEMPERATURE ROSE...

31. It is mentioned in the passage that if the global temperature rose by 2 or 3 Celsius

degrees, ______.

A. half of the earth’s surface would be flooded

B. the sea level would rise by 20 centimeters

C. water supply would decrease by 50 percent

D. 20 to 50 percent of species could become extinct