The reason why all the solar energy falling on the earth can’t be utilized is that ______．
举一反三
- 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
- This passage centers mainly on ______ . A: harnessing energy through chemistry B: our last source of power C: how water power is produced D: the amount of solar energy that can be utilized
- Solar panels, wind turbines, hydro power and geothermal energy and hydrocarbons (natural gas or coal) can all be used to produce hydrogen (a primary energy).
- 在太阳系所有的行星中，哪颗行星离地球最近呢？ A: In all the planets in the solar system, which planet is closest to the Earth? B: Among all the planets in the solar system, which planet is near to the Earth? C: Of all the planets in the solar system, which planet is closest to the Earth?
- We all know the dangers of an earthquake: the _____ to buildings; the troubles can be caused by falling trees, and the terror occurs when the earth actually opens up.