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 1970 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 (10) of their first marriage was 25. The average age of men was about 27. Men and women in the United States marry (11) the first time at an average of five years later than people (12) in the 1950s. (13) , young adults of the 1950s married younger than did any previous (14) in U. S. history. Today’s later age of marriage is (15) the age of marriage between 1890 and 1940. (16) , a greater proportion of the population was married (95 percent) during the 1950s than at any time before (17) . Experts do not agree on (18) the "marriage rush" of the late 1940s and 1950s occurred, but most social scientists believe it represented a (19) to the return of peaceful life and prosperity after 15 years of severe economic (20) and war.

A:past B:passing C:throughout D:through

(Throughout) history, shoes (have been) worn not only (for) protection (and also) for decoration.（　）

A:Throughout B:have been C:for D:and also

The idea (that) learning is (a) lifelong process (has expressed) by philosophers and educationalists (throughout) the centuries.（　）

A:that B:a C:has expressed D:throughout

New Technique Promises Earlier Cancer Detection A new technique could revolutionize the early detection of cancer, giving sufferers a greater chance of beating the disease, American scientists said. Researchers at the Massachusetts Institute of Technology have devised a novel method of 【51】 changes in the nucleus of cells in the earliest stages of the disease." More than 85 percent of all cancers originate in the epithelium (上皮) that lines the internal surfaces of organs 【52】 the body. Although these are treatable 【53】 they are diagnosed in one of the preventable stages, early body damages are almost 【54】 to detect," said scientist Feld. " We present a new optical-probe (光学探子) technique based on light-scattering spectroscopy (分光镜检查) that is able 【55】 detect precancerous and early cancerous cells in cell-rich epithelia," he added in a statement. The new technique relies on the fact 【56】 cell nuclei change in the early stages of cancer and the differences scatter light in a characteristic way. Until now the changes were only detectable 【57】 a biopsy (活检) was taken, the scientists said. The new technique, 【58】 in the science journal Nature, can be used in conjunction with a routine cancer screening and surveillance technique which uses an endoscope (内窥镜) —a flexible optical probe 【59】 with cameras which is inserted into a cavity in the body—to check 【60】 cancers. The scientists said they 【61】 their new technique in four different organs during routine endoscopic cancer screening. The tip of the optical probe was brought into contact with the tissue to be tested and the scattering of light was recorded without the need for any tissue to be 【62】 , the scientists said. " Our results show that light-scattering spectroscopy has the potential to detect pre-cancerous body damages and preinvasive cancers throughout the body. This technique should 【63】 improve the efficiency of cancer screening and surveillance," the scientists said. Cancer is one of the biggest 【64】 in industrialized countries. 【65】 to figures from the World Health Organization, 10 million people were diagnosed with the disease worldwide in 1997 and six million died.

A:with B:without C:throughout D:for

New Technique Promises Earlier Cancer Detection A new technique could revolutionize the early detection of cancer, giving sufferers a greater chance of beating the disease, American scientists said. Researchers at the Massachusetts Institute of Technology have devised a novel method of 【51】 changes in the nucleus of cells in the earliest stages of the disease." More than 85 percent of all cancers originate in the epithelium (上皮) that lines the internal surfaces of organs 【52】 the body. Although these are treatable 【53】 they are diagnosed in one of the preventable stages, early body damages are almost 【54】 to detect," said scientist Feld. " We present a new optical-probe (光学探子) technique based on light-scattering spectroscopy (分光镜检查) that is able 【55】 detect precancerous and early cancerous cells in cell-rich epithelia," he added in a statement. The new technique relies on the fact 【56】 cell nuclei change in the early stages of cancer and the differences scatter light in a characteristic way. Until now the changes were only detectable 【57】 a biopsy (活检) was taken, the scientists said. The new technique, 【58】 in the science journal Nature, can be used in conjunction with a routine cancer screening and surveillance technique which uses an endoscope (内窥镜) —a flexible optical probe 【59】 with cameras which is inserted into a cavity in the body—to check 【60】 cancers. The scientists said they 【61】 their new technique in four different organs during routine endoscopic cancer screening. The tip of the optical probe was brought into contact with the tissue to be tested and the scattering of light was recorded without the need for any tissue to be 【62】 , the scientists said. " Our results show that light-scattering spectroscopy has the potential to detect pre-cancerous body damages and preinvasive cancers throughout the body. This technique should 【63】 improve the efficiency of cancer screening and surveillance," the scientists said. Cancer is one of the biggest 【64】 in industrialized countries. 【65】 to figures from the World Health Organization, 10 million people were diagnosed with the disease worldwide in 1997 and six million died.

A:with B:without C:throughout D:for

New Technique Promises Earlier Cancer Detection A new technique could revolutionize the early detection of cancer, giving sufferers a greater chance of beating the disease, American scientists said. Researchers at the Massachusetts Institute of Technology have devised a novel method of 【51】 changes in the nucleus of cells in the earliest stages of the disease." More than 85 percent of all cancers originate in the epithelium (上皮) that lines the internal surfaces of organs 【52】 the body. Although these are treatable 【53】 they are diagnosed in one of the preventable stages, early body damages are almost 【54】 to detect," said scientist Feld. " We present a new optical-probe (光学探子) technique based on light-scattering spectroscopy (分光镜检查) that is able 【55】 detect precancerous and early cancerous cells in cell-rich epithelia," he added in a statement. The new technique relies on the fact 【56】 cell nuclei change in the early stages of cancer and the differences scatter light in a characteristic way. Until now the changes were only detectable 【57】 a biopsy (活检) was taken, the scientists said. The new technique, 【58】 in the science journal Nature, can be used in conjunction with a routine cancer screening and surveillance technique which uses an endoscope (内窥镜) —a flexible optical probe 【59】 with cameras which is inserted into a cavity in the body—to check 【60】 cancers. The scientists said they 【61】 their new technique in four different organs during routine endoscopic cancer screening. The tip of the optical probe was brought into contact with the tissue to be tested and the scattering of light was recorded without the need for any tissue to be 【62】 , the scientists said. " Our results show that light-scattering spectroscopy has the potential to detect pre-cancerous body damages and preinvasive cancers throughout the body. This technique should 【63】 improve the efficiency of cancer screening and surveillance," the scientists said. Cancer is one of the biggest 【64】 in industrialized countries. 【65】 to figures from the World Health Organization, 10 million people were diagnosed with the disease worldwide in 1997 and six million died.

A:with B:without C:throughout D:for

New Technique Promises Earlier Cancer Detection A new technique could revolutionize the early detection of cancer, giving sufferers a greater chance of beating the disease, American scientists said. Researchers at the Massachusetts Institute of Technology have devised a novel method of 【51】 changes in the nucleus of cells in the earliest stages of the disease." More than 85 percent of all cancers originate in the epithelium (上皮) that lines the internal surfaces of organs 【52】 the body. Although these are treatable 【53】 they are diagnosed in one of the preventable stages, early body damages are almost 【54】 to detect," said scientist Feld. " We present a new optical-probe (光学探子) technique based on light-scattering spectroscopy (分光镜检查) that is able 【55】 detect precancerous and early cancerous cells in cell-rich epithelia," he added in a statement. The new technique relies on the fact 【56】 cell nuclei change in the early stages of cancer and the differences scatter light in a characteristic way. Until now the changes were only detectable 【57】 a biopsy (活检) was taken, the scientists said. The new technique, 【58】 in the science journal Nature, can be used in conjunction with a routine cancer screening and surveillance technique which uses an endoscope (内窥镜) —a flexible optical probe 【59】 with cameras which is inserted into a cavity in the body—to check 【60】 cancers. The scientists said they 【61】 their new technique in four different organs during routine endoscopic cancer screening. The tip of the optical probe was brought into contact with the tissue to be tested and the scattering of light was recorded without the need for any tissue to be 【62】 , the scientists said. " Our results show that light-scattering spectroscopy has the potential to detect pre-cancerous body damages and preinvasive cancers throughout the body. This technique should 【63】 improve the efficiency of cancer screening and surveillance," the scientists said. Cancer is one of the biggest 【64】 in industrialized countries. 【65】 to figures from the World Health Organization, 10 million people were diagnosed with the disease worldwide in 1997 and six million died.

A:with B:without C:throughout D:for