问题 选择题

深圳大运会即第26届世界大学生夏季运动会于2011年8月12日21时56分开幕,关于各项体育运动的解释,下列说法正确的是(  )

A.蹦床运动员在空中上升到最高点时处于超重状态

B.跳高运动员在越杆时处于平衡状态

C.举重运动员在举铃过头停在最高点时,铃处于平衡状态

D.跳远运动员助跑是为了增加自己的惯性,以便跳得更远

答案

A、蹦床运动员在空中上升到最高点时只受到重力的作用,加速度为重力加速度,处于失重状态,所以A错误;

B、平衡状态指的是物体处于静止或者是匀速直线运动状态,跳高运动员在越杆时,受到重力的作用,不是受力平衡状态,所以B错误;

C、举重运动员在举铃过头停在最高点时,玲处于静止状态,受力平衡,所以C正确;

D、惯性的大小只与物体的质量有关,跳远运动员助跑不是在增加自己的惯性,所以D错误.

故选C.

单项选择题

Education is one of the key words of our time. A man, without an education, many of us believe, is an unfortunate victim of unfortunate circumstances deprived of one of the greatest twentieth-century opportunities. Convinced of the importance of education, modern states "invest" in institutions of learning to get back "interest" in the form of a large group of enlightened young men and women who are potential leaders. Education, with its cycles of instruction so carefully worked out, is punctuated by textbooks--those purchasable wells of wisdom--what would civilization be like without its benefits

So much is certain: that we would have doctors and preachers, lawyers and defendants, marriages and births; but our spiritual outlook would be different. We would lay less stress on "facts and figures" and more on a good memory, on applied psychology, and on the capacity of a man to get along with his fellow-citizens. If our educational system were fashioned after its bookless past we would have the most democratic form of "college" imaginable. Among the people whom we like to call savages all knowledge inherited by tradition is shared by all; it is taught to every member of the tribe so that in this respect everybody is equally equipped for life.

It is the ideal condition of the "equal start" which only our most progressive forms of modern education try to reach again. In primitive cultures the obligation to seek and to receive the traditional instruction is binding on all. There are no "illiterates"--if the term can be applied to peoples without a script--while our own compulsory school attendance became law in Germany in 1642, in France in 1806, and in England 1976, and is still non-existent in a number of "civilized" nations. This shows how long it was before we considered it necessary to make sure that all our children could share in the knowledge accumulated by the "happy few" during the past centuries. Education in the wilderness is not a matter of monetary means. All are entitled to an equal start. There is none of the hurry that, in our society, often hampers the full development of a growing personality. There, a child grows up under the ever-present attention of his parents; therefore the jungles and the savages know of no "juvenile delinquency". No necessity of making a living away from home results in neglect of children, and no father is confronted with his inability to "buy" an education for his child.

Notes: juvenile delinquency 青少年犯罪。

According to the text, which of the following statements is true()

A. One without education today has few opportunities

B. We have not yet decided on our educational models

C. Compulsory schooling is legal obligation in several countries now

D. Our spiritual outlook is better now than before

单项选择题 A1型题