—Have you mended your shoes, Bob? —Yes,

题型:选择题

问题:

—Have you mended your shoes, Bob?

—Yes, I _________ them twenty minutes ago .

A.have mended

B.mend

C.had mended

D.mended

考点:过去进行时一般现在时过去完成进行时
题型:选择题

物质的分类和名称都具有一定的规律性.五氧化二磷、二氧化碳、二氧化硫、氧化铝等物质都属于氧化物.根据下列物质的名称判断,其中属于氧化物的是(  )

A.氯化钠

B.三氧化二铁

C.铁

D.红磷

题型:选择题

自动变速器中,发动机的选挡杆置于()位时,汽车能起动。

A.N

B.P

C.L

D.S

题型:选择题

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.

1()

A.in

B.for

C.at

D.on

题型:选择题

过程A2中的命令输出结果是 【9】 ,过程A1中的命令输出结果是 【10】 ,主程序A中的命令输出的结果是 【11】 。 A过程如下: SET TALK OFF A=0 B=0 DO A1 A,B RETURN A1过程如下: PRIVATE A A="Welcome1!” B=“Yes” DO A2 A,B A2过程如下: A,B PRIVATE B A=999 B=888 RETURN

题型:选择题

科学是一种(),与经济、政治、文化、教育等体制并存互动。

A.认识活动

B.知识体系

C.社会建制

D.权威产物

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