题目内容
（请给出正确答案）
What can give waters a brownish hue near the shore？
A．Sediment.
B．Phytoplankton.
C．Blue pigment.
D．Diatoms.
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更多“What can give waters a brownish hue near the shore？A．Sediment.B．Phytoplankton.C．Blue pigme”相关的问题
A、We should be aware of our own limits
B、We must be tolerant and learn from our opponents
C、We must learn to be confident and self-motivated
D、We should never trust our own senses
The Transformation consists of all the changes that are occurring m human life due to advancing technology. For thousands of years such progress occurred slowly. Now, everything is changing so fast that you may find yourself wondering where all this progress is really leading.
Nobody knows what all these changes really will mean in the long run. But this mysterious Transformation is the biggest story of all time. It is the story of the human race itself.
Some people worry about what will happen when the deposits of petroleum are gone, but already researchers are finding all kinds of new ways to obtain energy. Someday, solar power collected by satellites circling the earth of fission power manufactured by mankind may give us all the energy we need for an expanding civilization. Space exploration promises to open up many new territories for human settlement, as well as leading to the harvest of mineral resources like the asteroids.
Scientific research continues to open up previously undreamed-of possibilities. Fifty years ago, few people could even imagine things like computers, lasers, and holography. Today, a host of newly emerging technologies such as artificial intelligence and genetic engineering are opening up all kinds of new paths for technologists.
Like it or not, our advancing technology has made us masters of the earth. We not only dominate all the other animals, but we are reshaping the world's plant life and even its soil and rocks, its waters and surrounding air. Mountains are being dug up to provide minerals and stone for buildings. The very ground under our feet is washing away as we chop down the forests, plow up the fields, and excavate foundations for our buildings.
Human junk is cluttering up not only the land but even the bottom of the sea. And so many chemicals are being released into the air by human activities that scientists worry that the entire globe may warm, causing the polar icecaps to melt and ocean waters to flood vast areas of the land.
During the twentieth century, advancing technology has enabled man to reach thousands of feet into the ocean depths and to climb the highest mountains. Mount Everest, the highest mountain of all, resisted all climbers until the 1950's. Now man is reaching beyond Earth to the moon, Mars, and the stars.
No one knows what the Great Transformation means or where it will ultimately lead. But one thing is sure: Human life 50 years from now will be very different from what it is today.
It's also worth noting that our wondrous technology is posing an increasingly insistent question: When we can do so many things, how can we possibly decide what we really should do？ When humans were relatively powerless, they didn't have to make the choices they have to make today.
Technology gives us the power to build a magnificent new civilization—if we can just agree on what we want it to be. But today, there is little global agreement on goals and how we should achieve them.
So it remains to be seen what will happen as a result of our technology. Pessimists worry that we will use the technology eventually to blow ourselves up. But they have been saying that for decades, and so far we have escaped. Whether we will continue to do so remains unknown—but we can continue to hope.
The Great Transformation is caused by______.
A．artificial intelligence and genetic engineering
B．the shortage of natural resources
C．the development of practical science
D．unknown reasons
Dr Carlton -- an oceanographer at Williams College in Williamstown, Mass. -- explains that, at any given moment, "there are several thousand (marine) species (traveling)... in the ballast water of ships." These creatures move from coastal waters where they fit into the local web of life to places where some of them could tear that web apart. This is the larger dimension of the infamous invasion of fish-destroying, pipe- clogging zebra mussels.
Such voracious invaders at least make their presence known. What concerns Carlton and his fellow marine ecologists is the lack of knowledge about the hundreds of alien invaders that quietly enter coastal waters around the world every day. Many of them probably just die out. Some benignly -- or even beneficially -- join the local scene. But some will make trouble.
In one sense, this is an old story. Organisms have ridden ships for centuries. They have clung to hulls and come along with cargo. What's new is the scale and speed of the migrations made possible by the massive volume of ship-ballast water -- taken in to provide ship stability -- continuously moving around the world...
Ships load up with ballast water and its inhabitants in coastal waters of one port and dump the ballast in another port that may be thousands of kilometers away. A single load can run to hundreds of gallons. Some larger ships take on as much as 40 million gallons. The creatures that come along tend to be in their larva freefloating stage. When discharged in alien waters they can mature into crabs, jellyfish, slugs, and many other forms.
Since the problem involves coastal species, simply banning ballast dumps in coastal waters would, in theory, solve it. Coastal organisms in ballast water that is flushed into midocean would not survive. Such a ban has worked for North American Inland Waterway. But it would be hard to enforce it worldwide. Heating ballast water or straining it should also halt the species spread. But before any such worldwide regulations were imposed, scientists would need a clearer view of what is going on.
The continuous shuffling of marine organisms has changed the biology of the sea on a global scale. It can have devastating effects as in the case of the American comb jellyfish that recently invaded the Black Sea. It has destroyed that sea's anchovy fishery by eating anchovy eggs. It may soon spread to western and northern European waters.
The maritime nations that created the biological "conveyor belt" should support a coordinated international effort to find out what is going on and what should be done about it.
According to Dr Carlton, ocean organisms are
A．being moved to new environments.
B．destroying the planet.
C．succumbing to the zebra mussel.
D．developing alien characteristics.
You can give the meaning of a word by specifying what it refers to.()
参考答案：错误
What advice does the supplier give to the customer？
He hopes that the customer can consider ______.
A．It's nothing.
B．No, there isn't.
C．Yes, I'll give you.
D．Certainly, what can I do for you？
What kind of information can the computer give to the firemen when they answer a call
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