Energy is ___ for life, and food was the first source of energy.
A: superficial
B: variable
C: essential
D: prosperous
A: superficial
B: variable
C: essential
D: prosperous
举一反三
- 单选题 ( 2.0 分 )<br/>Which of the following statements is true according to the<br/>passage? A: Nuclear power is a safe and reliable energy source. B: solar energy is always available as a source of energy. C: Water and steam energy has been successfully used in some<br/>countries. D: The real solution to energy crisis lies in natural sources of<br/>energy.
- Apparent metabolizable energy（AME）is the remaining energy after subtracting（ ）from the gross energy. A: Fecal energy B: Urine energy C: Metabolizable fecal energy D: Gas energy E: Endogenous urine energy
- The production process of thermal power plant is to convert () of fuel into electric energy. A: chemical energy B: heat energy C: mechanical energy D: kinetic energy
- Hydrogen, which is ______ than off, is pretty easy to produce and does no harm to the environment. A: much energy more abundant source B: an energy source more abundant C: a much more energy abundant source D: a much more abundant energy source
- In the future, China's energy consumption will still be dominated by fossil energy, in which coal is the main energy.