[填空题]Developing alternative energy sources is the most effective method to cope with energy problems both in the short and long terms.

[填空题]Developing alternative energy sources is the most effective method to cope with energy problems both in the short and long terms.

[填空题]Among the alternative energy sources,______, and coal are the cheapest forms today.

[填空题]Harrison:
Of all energy sources, nuclear energy has perhaps the lowest impact on the environment, especially in relation to kilowatts produced, because nuclear plants do not emit harmful gases, require a relatively small area, and effectively mitigate other impacts. In other words, nuclear energy is the most" eco-efficient" of all energy sources because it produces the most electricity in relation to its minimal environmental impact. There are no significant adverse effects to water, land, habitats, species and air resources
Jeffery:
The radioactive particles in low-level waste emit the same types of radiation that everyone receives from nature. The U. S. Nuclear Regulatory Commission requires that releases of radiation at a disposal site not exceed an annual dose to any member of the public of 25 milligrams to the whole body. In comparison, the average American is exposed to about 360 milligrams of radiation annually mostly from natural sources ( such

[单项选择]Compared to alternative energy, one of the disadvantages of fossil fuels is ______.
A. mining is difficult
B. it costs a lot of money to preserve
C. they are difficult to be processed
D. they are non-renewable

[单项选择]In addition to the established energy sources such as gas, coal, oil and nuclear, there are a number of other sources that we ought to consider. Two of these are hydroelectric and tidal power.
These two sources are (21) in that they are both renewable. (22) , hydropower is more widely used than tidal. In (23) , a substantial amount of electricity is already produced in HEP (hydroelectric power) stations worldwide, (24) tidal stations are still in the very early (25) of development.
As far as geographical (26) is concerned, HEP projects are to be found on lakes and rivers, while tidal (27) are constructed only at river mouths where tidal (28) is great. Unfortunately these are (29) in number. At present HEP stations are found mainly in Norway, Canada, Sweden and Brazil, whereas tidal plants are in (30) in France, Russia and China.
As regards capital (31)
A. conveniently
B. beneficially
C. advantageously
D. favorably