Mysteries of the Sea            The sea is the largest unknown part of our world. Much of this vast blanket of water is still to be discovered.Luckily, no single nation has to learn all about the ocean by itself. The world sea is owned by no one; it surrounds the earth and belongs to us all. Scientists in many different countries are working to explain its mysteries.Some are studying ways of bringing the ocean's huge supply of water to the deserts of the world. Others are studying the ways in which sound travels and is affected by water and heat. What happens when sea water touches different elements （元素） is another subject of study. These are just a few of the questions which ocean scientists are working on.One of the most interesting projects in oceangraphy（海洋学） is the work of mapping the occean floor. Only a very small part of it has been mapped. This was not important when only surface ships sailed the world's oceans, but it can mean the difference between life and death to men in ships going underwater.Long ago there was only one way to find out how deep the ocean was. A seaman would throw a heavy rope over the side of his ship. Then he pulled the rope up after it had reached the bottom. But this was not a very accurate way of measuring.In the 20th century, a better way was found. Sound was used to measure the ocean. An American Navy ship sailed into a narrow area of water to do an experiment. Seamen dropped some equipment that would produce a loud noise when it hit the bottom. And a little instrument measued the time it took for the sound to reach the ship. This has helped scientists map the ocean floor. Our knowledge about the sea is _____.

Mysteries of the Sea            The sea is the largest unknown part of our world. Much of this vast blanket of water is still to be discovered.Luckily, no single nation has to learn all about the ocean by itself. The world sea is owned by no one; it surrounds the earth and belongs to us all. Scientists in many different countries are working to explain its mysteries.Some are studying ways of bringing the ocean's huge supply of water to the deserts of the world. Others are studying the ways in which sound travels and is affected by water and heat. What happens when sea water touches different elements （元素） is another subject of study. These are just a few of the questions which ocean scientists are working on.One of the most interesting projects in oceangraphy（海洋学） is the work of mapping the occean floor. Only a very small part of it has been mapped. This was not important when only surface ships sailed the world's oceans, but it can mean the difference between life and death to men in ships going underwater.Long ago there was only one way to find out how deep the ocean was. A seaman would throw a heavy rope over the side of his ship. Then he pulled the rope up after it had reached the bottom. But this was not a very accurate way of measuring.In the 20th century, a better way was found. Sound was used to measure the ocean. An American Navy ship sailed into a narrow area of water to do an experiment. Seamen dropped some equipment that would produce a loud noise when it hit the bottom. And a little instrument measued the time it took for the sound to reach the ship. This has helped scientists map the ocean floor. The third paragraph is mainly about _____.

Mysteries of the Sea            The sea is the largest unknown part of our world. Much of this vast blanket of water is still to be discovered.Luckily, no single nation has to learn all about the ocean by itself. The world sea is owned by no one; it surrounds the earth and belongs to us all. Scientists in many different countries are working to explain its mysteries.Some are studying ways of bringing the ocean's huge supply of water to the deserts of the world. Others are studying the ways in which sound travels and is affected by water and heat. What happens when sea water touches different elements （元素） is another subject of study. These are just a few of the questions which ocean scientists are working on.One of the most interesting projects in oceangraphy（海洋学） is the work of mapping the occean floor. Only a very small part of it has been mapped. This was not important when only surface ships sailed the world's oceans, but it can mean the difference between life and death to men in ships going underwater.Long ago there was only one way to find out how deep the ocean was. A seaman would throw a heavy rope over the side of his ship. Then he pulled the rope up after it had reached the bottom. But this was not a very accurate way of measuring.In the 20th century, a better way was found. Sound was used to measure the ocean. An American Navy ship sailed into a narrow area of water to do an experiment. Seamen dropped some equipment that would produce a loud noise when it hit the bottom. And a little instrument measued the time it took for the sound to reach the ship. This has helped scientists map the ocean floor. Ocean scientists are interested in _____.

Mysteries of the Sea            The sea is the largest unknown part of our world. Much of this vast blanket of water is still to be discovered.Luckily, no single nation has to learn all about the ocean by itself. The world sea is owned by no one; it surrounds the earth and belongs to us all. Scientists in many different countries are working to explain its mysteries.Some are studying ways of bringing the ocean's huge supply of water to the deserts of the world. Others are studying the ways in which sound travels and is affected by water and heat. What happens when sea water touches different elements （元素） is another subject of study. These are just a few of the questions which ocean scientists are working on.One of the most interesting projects in oceangraphy（海洋学） is the work of mapping the occean floor. Only a very small part of it has been mapped. This was not important when only surface ships sailed the world's oceans, but it can mean the difference between life and death to men in ships going underwater.Long ago there was only one way to find out how deep the ocean was. A seaman would throw a heavy rope over the side of his ship. Then he pulled the rope up after it had reached the bottom. But this was not a very accurate way of measuring.In the 20th century, a better way was found. Sound was used to measure the ocean. An American Navy ship sailed into a narrow area of water to do an experiment. Seamen dropped some equipment that would produce a loud noise when it hit the bottom. And a little instrument measued the time it took for the sound to reach the ship. This has helped scientists map the ocean floor. Before the 20th century, the measuring of the depth of the sea was _____.

Mysteries of the Sea            The sea is the largest unknown part of our world. Much of this vast blanket of water is still to be discovered.Luckily, no single nation has to learn all about the ocean by itself. The world sea is owned by no one; it surrounds the earth and belongs to us all. Scientists in many different countries are working to explain its mysteries.Some are studying ways of bringing the ocean's huge supply of water to the deserts of the world. Others are studying the ways in which sound travels and is affected by water and heat. What happens when sea water touches different elements （元素） is another subject of study. These are just a few of the questions which ocean scientists are working on.One of the most interesting projects in oceangraphy（海洋学） is the work of mapping the occean floor. Only a very small part of it has been mapped. This was not important when only surface ships sailed the world's oceans, but it can mean the difference between life and death to men in ships going underwater.Long ago there was only one way to find out how deep the ocean was. A seaman would throw a heavy rope over the side of his ship. Then he pulled the rope up after it had reached the bottom. But this was not a very accurate way of measuring.In the 20th century, a better way was found. Sound was used to measure the ocean. An American Navy ship sailed into a narrow area of water to do an experiment. Seamen dropped some equipment that would produce a loud noise when it hit the bottom. And a little instrument measued the time it took for the sound to reach the ship. This has helped scientists map the ocean floor. The American Navy experiment measured the ocean with _____.

Research Is a State of Mind① For many years,there has been much misunderstanding as to just what research is. The popular belief seems to be that there is something mysterious （神秘的） about it and every research requires expensive scientific equipment. Actually, this is not so. Research isn't a physical thing at all; it's a state of mind. It is a simple,organized way of trying to accomplish something you wish to do.② You start by selecting the problem. you would like to solve, and then you list at least ten reasons why it has not been solved. But in selecting the problem, you need to be sure that it is worth the effort. Remember, it takes just as much effort to solve a useless problem as a useful one.③After carefully selecting the problem and the ten things between you and the solution, you then use the same procedure as in solving a crossword puzzle （填字游戏）. You start with the less serious difficulties, and eventually you arrive at the one or two major ones. In the solution of the remaining difficulties, you may need some simple equipment,but what you need most is patience. Few people realize how hard it is to do anything new.④ Maybe one of the reasons people are so easily discouraged is because of their Education. During all our years at school, we were examined two or three times a year. If we failed once, we were out. However, all research work is 99.9% failure and, if we succeed once, we are in. If we are going to make progress, we must learn to fail intelligently so that we won't become discouraged at the 99.9% failure. Paragraph①: _____.

Research Is a State of Mind① For many years,there has been much misunderstanding as to just what research is. The popular belief seems to be that there is something mysterious （神秘的） about it and every research requires expensive scientific equipment. Actually, this is not so. Research isn't a physical thing at all; it's a state of mind. It is a simple,organized way of trying to accomplish something you wish to do.② You start by selecting the problem. you would like to solve, and then you list at least ten reasons why it has not been solved. But in selecting the problem, you need to be sure that it is worth the effort. Remember, it takes just as much effort to solve a useless problem as a useful one.③After carefully selecting the problem and the ten things between you and the solution, you then use the same procedure as in solving a crossword puzzle （填字游戏）. You start with the less serious difficulties, and eventually you arrive at the one or two major ones. In the solution of the remaining difficulties, you may need some simple equipment,but what you need most is patience. Few people realize how hard it is to do anything new.④ Maybe one of the reasons people are so easily discouraged is because of their Education. During all our years at school, we were examined two or three times a year. If we failed once, we were out. However, all research work is 99.9% failure and, if we succeed once, we are in. If we are going to make progress, we must learn to fail intelligently so that we won't become discouraged at the 99.9% failure. Paragraph②: _____.

Research Is a State of Mind① For many years,there has been much misunderstanding as to just what research is. The popular belief seems to be that there is something mysterious （神秘的） about it and every research requires expensive scientific equipment. Actually, this is not so. Research isn't a physical thing at all; it's a state of mind. It is a simple,organized way of trying to accomplish something you wish to do.② You start by selecting the problem. you would like to solve, and then you list at least ten reasons why it has not been solved. But in selecting the problem, you need to be sure that it is worth the effort. Remember, it takes just as much effort to solve a useless problem as a useful one.③After carefully selecting the problem and the ten things between you and the solution, you then use the same procedure as in solving a crossword puzzle （填字游戏）. You start with the less serious difficulties, and eventually you arrive at the one or two major ones. In the solution of the remaining difficulties, you may need some simple equipment,but what you need most is patience. Few people realize how hard it is to do anything new.④ Maybe one of the reasons people are so easily discouraged is because of their Education. During all our years at school, we were examined two or three times a year. If we failed once, we were out. However, all research work is 99.9% failure and, if we succeed once, we are in. If we are going to make progress, we must learn to fail intelligently so that we won't become discouraged at the 99.9% failure. Paragraph③: _____.

Research Is a State of Mind① For many years,there has been much misunderstanding as to just what research is. The popular belief seems to be that there is something mysterious （神秘的） about it and every research requires expensive scientific equipment. Actually, this is not so. Research isn't a physical thing at all; it's a state of mind. It is a simple,organized way of trying to accomplish something you wish to do.② You start by selecting the problem. you would like to solve, and then you list at least ten reasons why it has not been solved. But in selecting the problem, you need to be sure that it is worth the effort. Remember, it takes just as much effort to solve a useless problem as a useful one.③After carefully selecting the problem and the ten things between you and the solution, you then use the same procedure as in solving a crossword puzzle （填字游戏）. You start with the less serious difficulties, and eventually you arrive at the one or two major ones. In the solution of the remaining difficulties, you may need some simple equipment,but what you need most is patience. Few people realize how hard it is to do anything new.④ Maybe one of the reasons people are so easily discouraged is because of their Education. During all our years at school, we were examined two or three times a year. If we failed once, we were out. However, all research work is 99.9% failure and, if we succeed once, we are in. If we are going to make progress, we must learn to fail intelligently so that we won't become discouraged at the 99.9% failure. Paragraph④: _____.

Research Is a State of Mind① For many years,there has been much misunderstanding as to just what research is. The popular belief seems to be that there is something mysterious （神秘的） about it and every research requires expensive scientific equipment. Actually, this is not so. Research isn't a physical thing at all; it's a state of mind. It is a simple,organized way of trying to accomplish something you wish to do.② You start by selecting the problem. you would like to solve, and then you list at least ten reasons why it has not been solved. But in selecting the problem, you need to be sure that it is worth the effort. Remember, it takes just as much effort to solve a useless problem as a useful one.③After carefully selecting the problem and the ten things between you and the solution, you then use the same procedure as in solving a crossword puzzle （填字游戏）. You start with the less serious difficulties, and eventually you arrive at the one or two major ones. In the solution of the remaining difficulties, you may need some simple equipment,but what you need most is patience. Few people realize how hard it is to do anything new.④ Maybe one of the reasons people are so easily discouraged is because of their Education. During all our years at school, we were examined two or three times a year. If we failed once, we were out. However, all research work is 99.9% failure and, if we succeed once, we are in. If we are going to make progress, we must learn to fail intelligently so that we won't become discouraged at the 99.9% failure. It is popularly believed that all research needs_____.