B Can you imagine traveling to work in a one-man submarine? Some scientists believe that some day one-man submarines will be as numerous (许多) as automobiles are today. A famous French driver says, “One day soon, men will walk on the ocean floor as they do on the street!” Perhaps during your lifetime people will travel, work, and live in the sea. If human beings want to live in the ocean, many human problems will need to be studied first. Some of these problems, similar to those of living in outer space, are pressure, lack of oxygen and weightlessness. Many questions remain unanswered．For example, can our blood adjust itself to underwater surroundings? What will happen to our muscle if we live in the water very long? Scientists are searching for answers. Perhaps in the future man will live in the sea, away from the crowded and noisy cities on land．The sea has plenty of space, not only for floating communities (团体) and parks, but also for storing supplies and for underwater travel. Some scientists believe that ocean living will benefit man in more than physical ways. In the freedom and beauty of the deep sea, man may find new sources of joy. 60．According to the passage, which of the following is true? A．Man will live in the sea just like living on the earth in time. B．Human beings can now freely walk on the ocean floor just like walking on the street. C．There are as many submarines as automobiles in the ocean. D．A famous French driver found a safe way to travel to the ocean floor. 61．If human beings want to live in the ocean, _____. A．problems such as pressure, lack of oxygen and weightlessness have to be solved B．people have to answer many questions asked by scientists C．underwater surroundings must be improved to fit the human bodies D．human muscle must be exposed in the water for a long time 62．Which of the following might not be the reason for the people who want to live in the ocean? A．The sea has plenty of space. B．The cities on land are crowded, noisy and polluted. C．Ocean living will do good to them in physical ways and spiritual ways. D．There are communities and parks on the ocean floor. 63．What’s the best title of the passage? A．The Use of One-man Submarine        B．Living Things in the Ocean C．Ocean Living                            D．Beauty of Ocean Floor