Geothermal（地?zé)岬模?power generation is one of our most stable renewable energy resources.Heat generated below the Earth's surface can provide an almost unlimited supply to power and heat homes.And while geothermal electricity only accounts for around one percent of global generation，that is set to at least triple by 2050.
The Geysers in California is the world's largest geothermal electricity complex.It produces enough electricity from its 18 power plants for 725，000 homes，totaling 20 percent of the state's renewable energy.Superheated "dry steam" is channeled from a large sandstone reservoir heated by a large magma chamber（巖漿房） more than four miles beneath the surface.
Heat is captured from its passage through the rock and the heated water converts into electricity.Cooled water is then recycled and pumped back to gather more heat.EGS （enhanced geothermal systems） technologies will open up many more sites for geothermal energy. "You can effectively put a power plant anywhere，" said Will Pettit，director of the Geothermal Resources Council. "All you have to do is drill（鉆孔） deep enough and you will find hot rock."
Most geothermal plants actually use a flash steam technique，where hot water （at 360 F or 180 C） is drawn up，passed into lower pressure tanks and 'flashed' into steam to power a turbine（渦輪機(jī)）.Binary cycle（雙元循環(huán)） plants are the growth technology because they can operate at lower water temperatures and more diverse geographical locations.They use moderately hot water to heat a secondary fluid with a lower boiling point — as low as 135 F — to drive turbines.
Geothermal plants already emit 11 times less carbon dioxide per unit of electricity than the average US coal power plant.They can also operate 24 hours a day to provide a solid base load for homes and businesses.
There are drawbacks too.Seismic activity around drilling wells is a factor.High investment costs are another.But the US government is backing the sector with multi-million dollar funds to push forward advanced EGS research.Geothermal energy is set to play a big part in the low-carbon electricity future.
（1）What do Will Pettit's words suggest in paragraph 3？ DD
A．It takes great effort to develop geothermal power.
B．Geothermal power development is money-consuming.
C．Geothermal power plants can be set up in certain places.
D．More geothermal energy can be found with advanced technology.
（2）What can be inferred from paragraph 4？ CC
A．Power plants are not affected by water.
B．Hot water is used to power a turbine directly.
C．Binary cycle plants are less restricted to locations.
D．A flash steam technique is a must in geothermal plants.
（3）What is the main idea of the article？ BB
A．Traditional power has been replaced by geothermal power in America.
B．Businesses are competing to gain an advantage in geothermal power.
C．Geothermal power is likely to be the best chance to sustainable power.
D．EGS technologies have come into widespread application around the world.
（4）What is the writer's attitude towards geothermal power？ AA
A．Optimistic.
B．Pessimistic.
C．Indifferent.
D．Concerned.
【考點(diǎn)】自然生態(tài)與環(huán)境保護(hù)；說明文．
【答案】D；C；B；A
【解答】
【點(diǎn)評(píng)】
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發(fā)布：2024/4/20 14:35:0組卷：4引用：5難度：0.5
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Our school held an activity on last Sunday because it was "Earth Day".Hundred of students took part in it.I am one of them.First，the headmaster gave us a speech about how to protect earth—our home.Then we went hiking，this was about 15km.Although the hiking was very tired，none were left behind.It is no doubt that all of us like the activity.In the future，they will try hardly to protect the environment.We hope we will take part in more activity about caring about the globe.發(fā)布：2024/6/27 10:35:59組卷：0引用：1難度：0.5 -
2．Leading a sustainable （可持續(xù)的） lifestyle doesn't require you to have to make great changes to your home，and this kind of transformation doesn't have to be an exhausting exercise. （1）
Here are three of them.
（2）By using solar energy，you will make your home far more sustainable.Solong as there is the sun in the sky，the solar panels atop your house will catch the rays and then transform them into electricity.
Make changes to your water drinking habits.Have you ever thought about how many single-use plastic bottles you use a year？If you should ever perform such a count，you'd find yourself well into three figures，or maybe even four. （3）To be truly sustainable，you've to change your water drinking habits.
（4）More often than not，these types of straws are used only once before being got rid of and taking up valuable landfill space.
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You have the power to make a sustainable change to your lifestyle—take the above advice and don't waste it.
A．Turn to solar energy.
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F．Another change you can make in this instance is to stop using plastic straws.
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3．The Sixth Extinction（滅絕） Extinctions，where entire species are wiped out，are not unusual in our Earth's history.In fact，over 90 percent of all species that ever lived are now extjye.aict.In the last 500 million years，there have been five times when life on Earth has almost ended.These include the third mass extinction，known as the"Great Dying"，which killed 90% to 96% of all species.And the fifth event，which occurred 66 million years ago，caused the death of the dinosaurs.The reasons for extinctions are varied.According to scientists，they include volcanic eruptions，asteroids （小行星） hitting the Earth from space，changes in sea levels，the decrease of the oxygen content of the sea and global warming.Many scientists say we are now entering the Earth's sixth mass extinction.This time，human activity will be to blame.
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（1）What are the reasons for extinction in the history？
（2）Why does the writer believe we will probably die out if 3/4 of the Earth's species die out？
（3）Please decide which part is false in the following statement，then underline it and explain why.
It is not unusual for species to die out naturally，so we human beings are not to blame.
（4）What actions can we take to avoid the sixth extinction？ （In about 40 words）發(fā)布：2024/6/27 10:35:59組卷：3引用：1難度：0.5
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