A.about the same as that of North and South America |
B.larger than that of North and South America |
C.hardly equal to that of North and South America |
D.far smaller than that of North and South America |
A.get enough food, oxygen and water |
B.develop commerce |
C.make discoveries important |
D.explore the possibilities of industrial development |
A.all kinds of manufactured goods |
B.commercial development |
C.making such things as industrial diamonds |
D.medical operations |