女性血中雌激素主要是与A．硫酸盐结合 B．葡萄糖醛酸盐结合 C．β球蛋白结合 D．α

The effect of the baby boom on the schools helped to make possible a shift in thinking about the role of public education in the 1920’s. In the 1920’s, but especially (1) the Depression of the 1930’s, the United States experienced a (2) birth rate. Then with the prosperity (3) on by the Second World War and the economic boom that followed it, young people married and (4) households earlier and began to (5) larger families than had their (6) during the Depression. Birth rates rose to 102 per thousand in 1946, 106.2 in 1950, and 118 in 1955. (7) economics was probably the most important (8) , it is not the only explanation for the baby boom. The increased value placed (9) the idea of the family also helps to (10) this rise in birth rates. The baby boomers began streaming (11) the first grade by the mid-1940’s and became a (12) by 1950. The public school system suddenly found itself (13) The wartime economy meant that few new schools were buih between 1940 and 1945. (14) , large numbers of teachers left their profession during that period for better-paying jobs elsewhere.

(15) , in the 1950’s, the baby boom hit an antiquated and inadequate school system. Consequently, the custodial rhetoric of the 1930’s no longer made (16) ; keeping youths ages sixteen and older out of the labor market by keeping them in school could no longer be a high (17) for an institution unable to find space and staff to teach younger children. With the baby boom, the focus of educators (18) turned toward the lower grades and back to basic academic skills and (19) . The system no longer had much (20) in offering nontraditional, new, and extra services to older youths.

11().

A. through

B. across

C. into

D. towards

把下面的句子改写成“把”字句。   

(1)轮船将人们送到天涯海角。

(2)足球被小明一脚踢进了球门。

学习食品雕刻的基础是（）

财产保险的保险金额低于保险价值的，当发生财产的全部损失时，除合同另有约定外，保险人按( )承担赔偿责任。

A．保险金额
B．保险价值
C．保险金额与保险价值的比例
D．实际损失数额

我国《债券登记、托管与结算业务实施细则》规定，中国结算公司设立回购交易质押品保管库，用于保管融券方结算参与人提交的质押券等质押品。( )