题干

若一次函数y=(2-k)x+3中y随x的增大而减小,则k的取值范围是(   )

A:k>2

B:k≤-2

C:k<-2

D:k≥-2

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答案(点此获取答案解析)

A

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    One of the greatest gifts one generation can give to other generations is the wisdom it has gained from experience. This idea has inspired the award-winning photographer Andrew Zuckerman. He interviewed and took photos of fifty oversixty-fiveyearsold all over the world. His project explores various aspects of their lives. The photos and interviews are now available on our website. Click on the introductions to read the complete interviews.

    Let us now have a culture of peace.——Federico Mayor Zaragoza, Spain Federico Mayor Zaragoza obtained a doctorate in pharmacy (药学) from the Complutense University of Madrid in 1958. After many years spent in politics, he became Director General of UNESCO in 1987. In 1999, he created the Foundation for a Culture of Peace, of which he is now the president. In addition to many scientific publications, he has published four collections of poems and several books of essays.

    Writing is a discovery.——Nadine Gordimer, South AfricaDue to a weak heart, Nadine Gordimer attended school and university briefly. She read widely and began writing at an early age. She published her first short story at the age of fifteen, and has completed a large number of works, which have been translated into forty languages. In 1991, Gordimer won the Nobel Prize for Literature.

    Jazz is about the only form of art today.——Dave Brubeck, USADave Brubeck studied music at the University of the Pacific and graduated in 1942. After World War Ⅱ he was encouraged to play jazz. In 1951, he recorded his first album(专辑). Brubeck's 1959 album has become a jazz standard. He received a Grammy Lifetime Achievement Award in 1996.For more figures CLICK HERE.

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材料一:两汉农村市场的兴起和发展,不是偶然的……小农的生产条件对社会依赖程度增加,他们为提高生产率,购置铁农具和大型牲畜等,不得不仰求于市场……农民当时虽属自给性生产,但在农副业及家庭纺织等方面,仍有部分剩余劳动产品的增长,使他们交换能力扩大……农村涌现出了一批工商业者,如当时有专门的铁匠、“贩盐”者、“屠狗”者、“开酒家 ”者 ,以及以贩马为业者等等,这各色人物的经营范围,有助于丰富农村市场的商品内容……小农追求富裕的思想,也具有为价值而生产的支配意识,在“农不如工,工不如商”的情况下更是如此。

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