东芝第一台冰箱是哪一年生产的？（)

A.1930

B.1940

C.1920

D.1950

A.1940

B.1950

C.1930

A.1930

B.1940

C.1950

D.1960

A.1950

B.1920

C.1930

D.1940

A.1950

B.1956

C.1965

D.1970

A.1930

B.1875

C.1960

D.1980

A.1930

B.1964

C.1965

D.2000

king about the role of public education was the effect of the baby boom of the 1950's and 1960's on the schools. In the 1920's, but especially in the Depression conditions of the 1930's, the United States experienced a declining birth rate-- every thousand women aged fifteen to forty-four gave birth to about 118 live children in 1920, 89. 2 in 1930, 75. 8 in 1936, and 80 in 1940.

With the growing prosperity brought on by the Second World War and the economic boom that followed it, young people married and established households earlier and began to raise large families than had their predecessors during the Depression. Birth rate rose to 102 per thousand in 1946, 106.2 in 1950, and 118 in 1955. Although economics was probably the most important factor, it is not the only explanation for the baby boom. The increased value placed on the idea of the family also helps to explain this rise in birth rates. The baby boomers began streaming into the first grade by the mid-1940's and became a flood by 1950. The public school system suddenly found itself overtaxed. While the number of school children rose because of wartime and postwar conditions, these same conditions made the schools even less prepared to cope with the flood. The wartime economy meant that few new schools were built between 1940 and 1945. Moreover, during the war and in the boom times that followed, large numbers of teachers left their profession for better- paying jobs elsewhere in the economy.

Therefore, in the 1950'S and 1960's, the baby boom hit an old- fashioned and inadequate school system. Consequently, it was impossible to keep youths aged sixteen and older in school as in 1930's and early 1940's. Schools were to find space and staff to teach younger children aged from five to sixteen. With the baby boom, the focus of educators and of laymen interested in education inevitably turned toward the lower grade and back to basic academic skills and discipline. The system no longer had much interest in offering nontraditional, new, and extra services to older youths.

What is the passage mainly concerned with？

A．The impact of the baby boom on public education.

B．Birth rates in the United States in the 1930's and 1940's.

C．The teaching profession during the baby boom.

D．The role of the family in the 1950's and 1960's.

A.1937

B.1930

C.1918

D.1922

A.1956

B.1950

C.1946

D.1940