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The Marriage Rate in U.S. The United States has historically had higher rates of marriage than those of other industrialized countries. The current annual marriage 1 in the United States-about 9 new marriages for every 1,000 people-is 2 higher than it is in other industrialized countries. However, marriage is 3 as widespread as it was several decades ago. 4 of American adults who are married 5 from 72 percent in I970 to 60 percent in 2002. This does not mean that large numbers of people will remain unmarried 6 their lives. Throughout the 20th century, about 90 percent of Americans married at some 7 in their lives. Experts 8 that about the same proportion of today’s young adults will eventually marry. The timing of marriage has varied 9 over the past century. In 1995 the average age of women in the United States at the time of their first marriage was 25. The average age of men was about 27. Men and women in the United States marry for the first time at an average of five years later than people did in the 1950s. 10 , young adults of the 1950s married younger than did any previous 11 in U.S. history. Today’s later age of marriage is 12 the age of marriage between 1890 and 1940. Moreover, a greater proportion of the population was married (95 percent) during the 1950s than at any time before 13 . Experts do not agree on why the "marriage rush" of the late 1940s and 1950s occurred, but most social scientists believe it represented a 14 to the return of peaceful life and prosperity after 15 years of severe economic 15 and war.
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The Marriage Rate in U.S. The United States has historically had higher rates of marriage than those of other industrialized countries. The current annual marriage 1 in the United States-about 9 new marriages for every 1,000 people-is 2 higher than it is in other industrialized countries. However, marriage is 3 as widespread as it was several decades ago. 4 of American adults who are married 5 from 72 percent in I970 to 60 percent in 2002. This does not mean that large numbers of people will remain unmarried 6 their lives. Throughout the 20th century, about 90 percent of Americans married at some 7 in their lives. Experts 8 that about the same proportion of today’s young adults will eventually marry. The timing of marriage has varied 9 over the past century. In 1995 the average age of women in the United States at the time of their first marriage was 25. The average age of men was about 27. Men and women in the United States marry for the first time at an average of five years later than people did in the 1950s. 10 , young adults of the 1950s married younger than did any previous 11 in U.S. history. Today’s later age of marriage is 12 the age of marriage between 1890 and 1940. Moreover, a greater proportion of the population was married (95 percent) during the 1950s than at any time before 13 . Experts do not agree on why the "marriage rush" of the late 1940s and 1950s occurred, but most social scientists believe it represented a 14 to the return of peaceful life and prosperity after 15 years of severe economic 15 and war.
The Marriage Rate in U.S. The United States has historically had higher rates of marriage than those of other industrialized countries. The current annual marriage 1 in the United States-about 9 new marriages for every 1,000 people-is 2 higher than it is in other industrialized countries. However, marriage is 3 as widespread as it was several decades ago. 4 of American adults who are married 5 from 72 percent in I970 to 60 percent in 2002. This does not mean that large numbers of people will remain unmarried 6 their lives. Throughout the 20th century, about 90 percent of Americans married at some 7 in their lives. Experts 8 that about the same proportion of today’s young adults will eventually marry. The timing of marriage has varied 9 over the past century. In 1995 the average age of women in the United States at the time of their first marriage was 25. The average age of men was about 27. Men and women in the United States marry for the first time at an average of five years later than people did in the 1950s. 10 , young adults of the 1950s married younger than did any previous 11 in U.S. history. Today’s later age of marriage is 12 the age of marriage between 1890 and 1940. Moreover, a greater proportion of the population was married (95 percent) during the 1950s than at any time before 13 . Experts do not agree on why the "marriage rush" of the late 1940s and 1950s occurred, but most social scientists believe it represented a 14 to the return of peaceful life and prosperity after 15 years of severe economic 15 and war.
The Marriage Rate in U.S. The United States has historically had higher rates of marriage than those of other industrialized countries. The current annual marriage 1 in the United States-about 9 new marriages for every 1,000 people-is 2 higher than it is in other industrialized countries. However, marriage is 3 as widespread as it was several decades ago. 4 of American adults who are married 5 from 72 percent in I970 to 60 percent in 2002. This does not mean that large numbers of people will remain unmarried 6 their lives. Throughout the 20th century, about 90 percent of Americans married at some 7 in their lives. Experts 8 that about the same proportion of today’s young adults will eventually marry. The timing of marriage has varied 9 over the past century. In 1995 the average age of women in the United States at the time of their first marriage was 25. The average age of men was about 27. Men and women in the United States marry for the first time at an average of five years later than people did in the 1950s. 10 , young adults of the 1950s married younger than did any previous 11 in U.S. history. Today’s later age of marriage is 12 the age of marriage between 1890 and 1940. Moreover, a greater proportion of the population was married (95 percent) during the 1950s than at any time before 13 . Experts do not agree on why the "marriage rush" of the late 1940s and 1950s occurred, but most social scientists believe it represented a 14 to the return of peaceful life and prosperity after 15 years of severe economic 15 and war.
Electromagnetic Energy 1. White light seems to be a combination of all colors. The energy that comes from a source of light is not limited to the kind of energy you can see. Heat is given off by a flame or an electric light. On a cloudy day it is possible to get a sunburn even though you feel cool. Visible light and the kind of energy that produce warmth and sunburn are examples of electromagnetic energy. 2. The sun is 93 million miles from the earth. Yet we can use energy from the sun because electromagnetic energy travels through space. 3. Many other kinds of energy are also types of electromagnetic energy. Radio, television, and radar signals travel from transmitters to receivers as low-energy electromagnetic waves. Infrared (红外的) radiation is an electromagnetic wave. When it is absorbed by matter, heat is produced. Waves of infrared and visible light have more energy than waves of radio, television, or radar. Ultraviolet rays (紫外线) and X-rays are electromagnetic waves with even greater amounts of energy. Infrared radiation is used in cooking food and heating buildings. Sunlight and electric lights are part of our requirements for normal living. Ultraviolet radiation is useful in killing certain disease organisms. X-rays and gamma rays have so mush energy that they travel right through solid objects. They can be used to detect and treat cancer. X-rays are used in industry to find hidden cracks in metal, and in medicine to reveal broken bones. 4. Usually we use electricity to generate electromagnetic energy. The source of most of our energy is the sun. Heat from the sun causes water to evaporate. When the water fails to the earth as rain, some of it is trapped behind dams and then used to operate electric generators. Other generators are powered by coal, but the energy stored in coal came from the sun, too. 5. Until recently, the source of the tremendous amount of energy given off by the sun was a puzzle. If the sun depended on chemical reactions, it would have used up all its energy long ago. Experiments with electromagnetic radiation led to the theory that mass can be converted into energy. About forty years after the theory was proposed, nuclear energy was harnessed (利用) by man. Chemical energy comes from electron (电子) rearrangement. Nuclear energy comes from a change in the nucleus of an atom. Compared with chemical reactions, nuclear reactions release millions of times more energy per pound of fuel. We now believe that the sun’s energy comes from the nuclear reactions in which hydrogen is changed into helium (氦). 6. Nuclear energy is beginning to compete with coal as an economical source of power to generate electricity. It is also being used to operate engines in large ships. Scientists continue to seek new and better methods of obtaining and using energy. A. Nuclear reactions as the lasting source of the sun’s energy B. The most important source of energy C. Types of electromagnetic energy D. The machines used for energy generation E. Seeking new sources of energy F. The use of ultraviolet radiation in medicine X-rays and gamma rays can be used to detect and treat cancer ______.
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