And he says the sea floor is, on average, at a depth of 4, 000 meters. And so, as some machines dive far below what people have previously seen, scientists are discovering new species of plants, animals and living things

　　Since the census project began, more than 5,300 new marine animals have been found. Ocean researchers say they hope to catalogue 230,000 species during the census —which some say is only a small part of all the creatures living in the sea.

　　47．Why do the researchers place small markers on many marine creatures?

　　A．To catch them.

　　B．To research them.

　　C．To kill them.

　　D．To protect them.

　　48．From what Ron O’Dor says, we can conclude that

　　.

　　A．human beings only know a little about marine life

　　B．the oceans don’t need to be further explored

　　C．he considers exploring the ocean a dangerous thing

　　D．the marine creatures mainly live on the top of the ocean

　　49．What can we learn from the passage?

　　A．About 2,000 scientists from America are involved in the project.

　　B．The census of sea life will last for ten years.

　　C．230,000 new marine animals have been found.

　　D．The sea floor is at a depth of 400 meters.

　　50．Why does the author write the passage?

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