问题 填空题

某型号汽车在水平公路上行驶时受到的阻力大小恒为2 000N.当汽车以10m/s的速度匀速行驶时,发动机的实际功率P=______W.当汽车从10m/s的速度继续加速时,发动机的功率将______汽车以10m/s的速度匀速行驶时发动机的功率(填“大于”、“等于”、“小于”).

答案

由于汽车匀速行驶,所以F=f=2 000N,所以发动机的实际功率 P=Fv=fv=2000×10=2×104W.

当汽车从10m/s的速度继续加速时,牵引力要变大,由P=FV可知,发动机的功率将变大.

故答案为:2×104;大于.

阅读理解与欣赏

阅读下面的文字,完成1-3题。

山川祭祀与敬畏民心

  泰山,从鲁国的名山到全国的名山,从享受山岳祭祀到承载封禅大典,除了伴随东方和儒家文化的成长壮大以外,还伴随着祭祀典礼层级的提高。而随着祭祀典礼层级的提高,泰山所代表的感恩观念也走上极致。

  《公羊传》曰:“山川有能润于百里者,天子秩而祭之。触石而出,肤寸而合,不崇朝而遍雨乎天下者,唯泰山尔!”山川之所以受到祭祀,是因为它们能够泽被四方。这种祭祀,就是一种感恩典礼。感谢山川,感谢天地。封禅泰山,是为了报功,其实也有感恩的一面。封禅,根据《五经正义》的解释是“易姓而王,致太平,必封泰山,禅梁父何?天命以为王,使理群生,告太平于天,报群神之功”。报功天地,到底是什么意思?一方面是汇报、报告,另一方面就是回报、报答,就是感恩天地。所有的祭祀,都有报恩之意。

  天子封禅,报功天地,为最高感恩典礼。成就这一盛典,不仅取决于帝王意愿,更取决于客观条件。所谓客观条件,按照管仲的说法,需要凤凰来仪,麒麟现身,还要有比目鱼出海。其实,最重要的是要天地祥和,万物茂盛,人民幸福。汉光武帝刘秀恢复汉家江山,即位三十年,群臣建议封禅泰山,而光武帝的回答是:“即位三十年,百姓怨气满腹,吾谁欺,欺天乎?”隋文帝一扫天下,让分裂的中国再次统一,但是当群臣建议封禅泰山的时候,文帝说“此事体大,朕何德以堪之”,最后只用南郊之礼祭祀泰山,不敢举行封禅之礼。

  中国古代,虽然没有西方式的宗教和上帝,但是古人有所敬畏,知所进退。天地受到崇敬,不仅是因为天地赐予万物,养育万民,也因为天地代表良心,代表善的意志。无其德而行其礼,是欺天灭祖。所以我们看到,很多帝王何尝没有自我表扬的需要,但是敬畏之心让他们却步。唐太宗几次决定封禅,或因大臣劝阻,或因天象异常,或因水灾出现,最后决定放弃封禅。封禅,对于帝王而言,是一种巨大无比的荣誉,因此有着可以想象的引力,但是很多帝王,如汉光武帝、隋文帝、唐太宗等,最后决定放弃,是因为他们有敬畏之心。孔子说,畏天命,畏大人之言。这些帝王敬畏的是什么?真的是无知无情的自然天地吗?当然不是。他们敬畏的是人心,是历史。他们害怕肆无忌惮的自我膨胀会导致怨声载道,导致天谴,导致历史的恶评。

  天地良心,算是一个成语,在中国的语境中,天地代表艮心。从春秋时代开始,中国人的天命观就发生了巨大改变,“天视自我民视,天听自我民听”,上天的意志代表人民的意愿。天地为万物之本,人民为邦国之本。从这个意义上说,感恩天地,就是感恩人民,敬畏天地,就是敬畏人心。(选自《泰山的祭祀与封禅》,有删改)

1.下列关于“祭祀山川”的理解,不符合原文意思的一项是(     )

A.祭祀山川,起源很早,有对一般山川的祭祀,有对特殊山川的祭祀,而泰山封禅是祭祀山川的最高礼节。

B.古人祭祀山川,是因为他们认为山川中“有能润于百里者”“不崇朝而遍雨乎天下者”,认为山川能泽被四方,赐予万物,养育万民。

C.因为儒家文化的不断成长壮大,祭祀山川的规格越来越高,泰山从享受山岳祭祀到承载封禅大典就是这方面的明证。

D.古人祭祀山川,作者认为其中有丰富而深刻的内涵,诸如对自然和民心的敬畏,对自然万物和芸芸众生的感激。

2.下列表述,不符合原文意思的一项是(     )

A.封禅,不是人人皆可为之的,也不是所有天子都可为之的,只有那些能让天地祥和、万物茂盛、人民幸福的天子才可为之。

B.天子封禅,报功天地,需要特定的客观条件,即凤凰来仪,麒麟现身,比目鱼出海。若贸然行之,就是欺天灭祖,就会自遭祸端。

C.“即位三十年,百姓怨气满腹,吾谁欺,欺天乎?”这句话或许是汉光武帝的场面之言,却也让我们看到了天子对民心的敬畏。

D.唐太宗几次决定封禅,最后又决定放弃,这是因为他有敬畏之心,但他敬畏的其实不是无知无情的自然天地,而是人心,是历史。

3.下列理解和分析,不符合原文内容的一项是(     )

A.汉光武帝、隋文帝没有泰山封禅,是因为他们的敬畏之心太强,但这并不意味着他们的感恩之心不足。

B.恢复汉家江山的汉光武帝刘秀,让分裂的中国再次统一的隋文帝,都没有贸然去泰山封禅,也有来自他们自身的原因。

C.很多帝王都有自我表扬的需要,但是他们害怕这种自我膨胀会导致怨声载道,导致历史的恶评,所以不得不收敛自己的行为。

D.因为天地为万物之本,人民为邦国之本,所以历史上天子祭祀山川就是要感恩人民,敬畏天地就是在敬畏人心。

单项选择题

When Mary Moore began her high school in 1951, her mother told her, "Be sure and take a typing course so when this show business thing doesn’t work out, you’ll have something to rely on." Mary responded in typical teenage fashion. From that moment on, "the very last thing I ever thought about doing was taking a typing course," she recalls.
The show business thing worked out, of course. In her career, Mary won many awards. Only recently, when she began to write Growing Up Again, did she regret ignoring her morn," I don’t know how to use a computer," she admits.
Unlike her 1995 autobiography, After All, her second book is less about life as an award-winning actress and more about living with diabetes (糖尿病). All the money from the book is intended for the Juvenile Diabetes Research Foundation (JDRF), an organization she serves as international chairman. "I felt there was a need for a book like this," she says. " I didn’t want to lecture, but I wanted other diabetics to know that things get better when we’re self-controlled and do our part in managing the disease."
But she hasn’t always practiced what she teaches. In her book, she describes that awful day, almost 40 years ago, when she received two pieces of life-changing news. First, she had lost the baby she was carrying, and second, tests showed that she had diabetes. In a childlike act, she left the hospital and treated herself to a box of doughnuts (甜甜圈). Years would pass before she realized she had to grow up—again—and take control of her diabetes, not let it control her. Only then did she kick her three-pack-a-day cigarette habit, overcome her addiction to alcohol, and begin to follow a balanced diet.
Although her disease has affected her eyesight and forced her to the sidelines of the dance floor, she refuses to fall into self-pity. "Everybody on earth can ask, ’why me’ about something or other," she insists. "It doesn’t do any good. No one is immune to heartache, pain, and disappointments. Sometimes we can make things better by helping others. I’ve come to realize the importance of that as I’ve grown up this second time. I want to speak out and be as helpful as I can be. \

What can we know from the last paragraph

A. Mary feels pity for herself.
B. Mary has recovered from her disease.
C. Mary wants to help others as much as possible.
D. Mary determines to go back to the dance floor.