How much energy given off by the sun reaches the earth
A: 100 % but indirectly
B: 5 %
C: 50 %
D: only a very tiny amount
A: 100 % but indirectly
B: 5 %
C: 50 %
D: only a very tiny amount
举一反三
- The sun' s energy indirectly provides the earth with（） A: fuels B: waterpower C: light D: both A and B
- The total amount of energy received per minute by the whole earth is a great sum, but it is only a tiny fraction of the total energy radiated by sun. A: sent in B: sent for C: sent out D: sent up
- About____ of the sun's energy reaches the earth's surface. A: One -quarte B: One-third C: A half
- The reason why all the solar energy falling on the earth can’t be utilized is that ______． A: only a very small part is available B: the sun is too distant from the earth C: it takes thousands of years for this energy to be stored up in coal and oil D: our scientific knowledge is not sufficient
- Of the sun’ s total output of radiant energy, the earth receives （） A: one tenth B: one millionth C: all that comes from the surface of the sun D: a very small portion