A: for
B: off
C: to
D: on
举一反三
- The sun basically provides Earth with_____ source of energy everyday. (limit)
- ( ) the earth to be flat, many feared that Columbus would fall off the edge of the earth.
- On Pandora corporations from earth are mining a rare mineral that is the key to solving the energy crisis on Earth.
- 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
- Geothermal energy is thermal energy ______ and stored in the Earth. A: exploded B: generated C: exterminated D: devastated
内容
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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
- 1
Things from Earth that people use are ___________. A: animal resources B: human resources C: natural resources
- 2
According to the author, the main problem of our environment today is ______. A: the increase of population B: the limited energy resources C: the more serious air pollution D: the development of technology
- 3
_________ that the earth was the center of the universe. A: People were once believed B: It had once believed C: People were believing D: It was once believed
- 4
__________ or (more often) of the technologies and organizations for harvesting, converting, and distributing those resources has meant insufficient energy benefits and hence inconvenience, deprivation and constraints on growth. A: Abundance of energy supply B: Adequacy of energy reserves C: Inadequacy of energy resources