单项选择题
A.hell B.place of great heat and fire C.furnace for smelting iron D.fireball
A.governments B.modern technology C.our rivers and forests D.the United Nations
A.All living creatures die in order to be eaten by others. B.All living creatures can be the food of others. C.All living creatures decay. D.Only a small number of living creatures can avoid being eaten by others.