更多"第三篇Renewable Energy Sources
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[单项选择]第三篇Renewable Energy Sources
Today petroleum(石油)provides around 40% of the world’s energy needs,mostly fuelling automobiles.Coal is still used,mostly in power stations,to cover one-quarter of our energy needs,but it is the least efficient,unhealthiest and most environmentally damaging fossil fuel(矿物燃料).Natural gas reserves could fill some of the gap from oil,but reserves of that will not last into the 22nd century either.Most experts predict we will exhaust easily accessible reserves within 50 years.Less-polluting renewable energy sources offer a more practical long-term energy solution.“Renewable”refers to the fact that these resources are not used faster than they can be replaced.
Hydroelectric(水力发电的)power is now the most common form of renewable energy,supplying around 20% of world electricity.China’s Three Gorges Dam is the largest ever.At five times the size of the US’s Hoover Dam,its 26 turbines(涡轮机)will generate the equivalent energy of 18 coal-fired power stations.It wil
A. is the first hydroelectric dam in the world.
B. is of the same size as the US’s Hoover Dam.
C. can generate around 3% of world electricity.
D. is the largest hydroelectric dam in the world.
[单项选择] 第一篇Renewable Energy Sources
Today petroleum(石油)provides around 40% of the world’s energy needs,mostly fuelling automobiles.Coal is still used,mostly in power stations,to cover one-quarter of our energy needs,but it is the least efficient,unhealthiest and most environmentally damaging fossil fuel(矿物燃料).Natural gas reserves could fill some of the gap from oil,but reserves of that will not last into the 22nd century either.Most experts predict we will exhaust easily accessible reserves within 50 years.Less-polluting renewable energy sources offer a more practical long-term energy solution.“Renewable”refers to the fact that these resources are not used faster than they can be replaced.
Hydroelectric(水力发电的)power is now the most common form of renewable energy,supplying around 20% of world electricity.China’s Three Gorges Dam is the largest ever.At five times the size of the US’s Hoover Dam,its 26 turbines(涡轮机)will generate the equivalent energy of 18 coal-fired power stations.It wi
A. Petroleum
B. Coal
C. Natural gas
D. Water
[单项选择]{{B}}第三篇{{/B}}
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Renewable Energy Sources
Today petroleum (石油)provides around 40% of the world’s energy needs,
mostly fuelling automobiles. Coal is still used, mostly in power stations, to
cover one-quarter of our energy needs, but it is the least efficient,
unhealthiest and most environmentally damaging fossil fuel(矿物燃料). Natural gas
reserves could fill some of the gap from oil, but reserves of that will not last
into the 22nd century either. Most experts predict we will exhaust easily
accessible reserves within 50 years. Less polluting renewable energy sources
offer a more practical long-term energy solution. "Renewable" refers to
the fact that these resources are not used faster than they can be
replaced.
Hydroelectric(水力发电的) power is now the most common form
of renewable energy, supplying aro
A. Petroleum.
B. Coal.
C. Natural gas
D. Water.
[单项选择]第三篇
Water
The second most important constituent (构成成份) of the biosphere (生物圈) is liquid water. This can only exist in a very narrow range of temperatures, since water freezes at 0℃ and boils at 100℃. Life as we know it would only be possible on the surface of a planet which had temperatures somewhere within this narrow range.
The earth’s supply of water probably remains fairly constant in quantity. The total quantity of water is not known very accurately, but it is about enough to cover the surface of the globe to a depth of about two and three-quarter kilometers. Most of it is in the form of the salt water of the oceans about 97 percent. The rest is fresh, but three quarters of this is in the form of ice at the Poles and on mountains, and cannot be used by living systems until melted. Of the remaining fractional which is somewhat less than one per cent of the whole, there is 10—20 times as much stored underground water as t
A. in the center of the earth.
B. on the surface of our planet.
C. in a very narrow range of temperatures.
D. in the coastal areas of the earth.
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