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如图所示是人和起重机分别将重物从地面提升到高处的情景。其中高台上的重物为人和起重机经过他们各自下方的时钟所显示的时间内提升的。根据甲、乙两图所示情景，判断下列说法，其中正确的是

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A、甲图中人和起重机做功一样多，所以二者功率一样大

B、甲图中人和起重机做功一样多，起重机所用时间短，所以起重机功率大

C、乙图中人比起重机做的功多，所以人做功的功率大

D、乙图中起重机和人比，它单位时间内做的功多，所以起重机功率大

答案

BD

单项选择题

The United States has historically had higher rates of marriage than those of other industrialized countries. The current annual marriage (51) in the United States—about 9 new marriages for every 1,000 people—is (52) higher than it is in other industrialized countries. However, marriage is (53) as widespread as it was several decades ago. (54) of American adults who are married (55) from 72 percent in 1970 to 60 percent in 2002. This does not mean that large numbers of people will remain unmarried (56) their lives. Throughout the 20th century, about 90 percent of Americans married at some (57) in their lives. Experts (58) that about the same proportion of today’s young adults will eventually marry.

The timing of marriage has varied (59) 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. (60) , young adults of the 1950s married younger than did any previous generation in U. S. history.

54().

A.Aproportion 

B.Theproportion 

C.Thenumber 

D.Anumber
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判断题

纳税人通过自设非独立核算门市部销售自产应税消费品，应当按照生产成本或移送数量计算征收消费税。
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