scientists think that there has been life on Earth for million of years

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• 英语翻译The earth has been storing up energy for the past 3.5 billion years.Ever since life has existed on this planet,photosynthetic organisms have been converting the transverse electromagnetic waves that come from the sun into energy.That energy is stored in the bonds between C-C atoms.When stuff dies,that energy remains in the bond.That carbon or “dead stuff” piles up,gets buried and is compacted forming vast stores of energy in the form of coal and o
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• 英语阅读解析高手进The Book Of Life So far,scientists have named about 1.8 million living species(物种),and that‘s just a small number of what probably exists on Earth.With so many plants,animal,and other living things covering the planet,it can be tough to figure out what type of grass is growing by the roadside or what kind of bird just flew by.A soon-to-be-started Web site might help.An international term of researchers has announced the creation of Web-based
• 英语翻译Although the prevailing supposition has been that it is too hot for microorganisms to survive deep below the Earth's surface,some scientists argue that there are living communities of microorganisms there that have been cut off from surface life for millions of years.These scientists base their argument on the discovery of living microorganisms in samples of material that were taken from holes drilled as deep as 1.74 miles.The scientists' argument
• Men have been interested in the stars ever since they first looked up into the sky.some of these stars may have their own planets.if that is so ,we can know that life may exist on e of them.the problem is that the nearest star is four light years away.In other words,light from it has been travelling for four years before it finally reaches us.Maybe nobody from earth will ever visit that star because it will take a rocket a hundred thousand years to re
• scientists think that there has been life on Earth for million of years为什么这里的on Earth是地球上的意思，地球上不是on the Earth?
• 英语翻译If you watch the sky about an hour after the sun goes down,you may see some “moving stars”.But they aren’t real stars.They’re satellites,a machine that has been sent into space and goes around the Earth,moon,etc.And the biggest of all is the International Space Station (ISS).The ISS is the biggest satellite because scientists want to live on it.They think that the best way to learn more about space is to live there.The space shuttle Discovery has
• Scientists think that there has been _____（life） on the earth for hundreds of millions of years.为什么课本用单数?
• Scientists think there has been life on Earth for ______ years.中间填millions of 还是2 million
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