问题 单项选择题

活塞头部有活塞环槽、一般()。

A.油环环槽多,气环环槽少

B.气环环槽多,油环环槽少

C.气环环槽与油环环槽一样多

D.不需要气环、油环

答案

参考答案:B

单项选择题


阅读下面短文,回答问题。
有位意大利的朋友告诉我说,除了脏一点、乱一点,北京城很像一座美国的城市。我想了一下,觉得这是实情——北京城里到处是现代建筑,缺少历史感。在我小时候就不是这样的,那时的北京的确有点与众不同的风格。举个例子来说,我小时候住在北京的郑王府里,那是一座优美的古典庭院,眼看着它变得面目全非,塞满了四四方方的楼房,丑得要死。郑王府的遭遇就是整个北京城的______ 。顺便说一句,英国的牛津城里,所有的旧房子,屋主有翻修内部之权,但外观一毫不准动,所以那座城市保持着优美的旧貌。所有的人文景观属于我们只有一次。假如你把它扒掉了,再重建起来就不是那么回事了。
这位意大利朋友告诉我说,他去过山海关的老龙头,看到那些新建的灰砖城楼,觉得很难看。我小时候见过北京城的城楼,还在城楼边玩耍过,所以我不得不同意他的意见。真古迹使人留恋之处,在于它历经沧桑直至如今,在它身边生活,你______会觉得历史至今还活着。______可以随意翻盖,______会把历史当作可以随意捏造的东西,一个人尽可夫的娼妇;这两种感觉真是大不相同。这位意大利朋友还说,意大利的古迹可以使他感到自己不是属于一代人,而是属于一族人,从古到如今。他觉得这样活着比较好。他的这些想法当然是有道理的,不过,现在我们谈这些已经有些晚了。
谈过了城市和人文景观,也该谈谈乡村和自然景观——谈这些还不算晚。房龙曾说,世界上最美丽的乡村就在奥地利的萨尔兹堡附近。那地方我也去过,满山枞木林,农舍就在林中,铺了碎石的小径一尘不染……。还有荷兰的牧场,弥漫着精心修整人工美。牧场中央有放干草的小亭子,油漆的整整齐齐,像是园林工人干的活;因为要把亭子造成那个样子,不但要手艺巧,还要懂得什么是好看。让别人看到自己住的地方是一种美丽的自然景观,这也是一种做人的态度。
我前半辈子走南闯北,去过国内不少地方,就我所见,贫困的小山村,只要不是穷到过不下了,多少还有点样。到了靠近城市的地方,人也算有了点钱才开始难看。家家户户房子宽敞了,院墙也高了,但是样子恶俗,而且门前渐渐和猪圈狗窝相类似。到了城市的近郊,到处是乱倒的垃圾。进了城里以后,街上是干净了,那是因为有清洁工在扫。只要你往楼道里看一看,阳台上看一看,就会发现,这里住的人比近郊区的人还要邋遢的多。总的来说,我以为现在到处是既不珍惜人文景观,也不保护自然景观的邋遢娘们邋遢汉。这种人要吃,要喝,要自己住的舒服,别的一概不管。
我的这位意大利朋友是个汉学家。他说,中国人只重写成文字的历史,不重保存在环境中的历史。这话从一个意大利人嘴里说出来,叫人无法辩驳。人家对待环境的态度比我们强的多。我以为,每个人都有一部分活在自己所在的环境中,这一部分是不会死的,它会保存在那里,让后世的人看到。在海德堡,在剑桥,在萨尔兹堡,你看到的不仅是现世的人,还有他们的先人,因为世世代代的维护,那地方才会像现在这样漂亮。
(节选自王小波《自然景观和人文景观》,载《沉默的大多数》,中国青年出版社,1997)

根据上下文,在第二自然段横线处依次填入最恰当的关联词语。

A.才 要是 那就

B.才 即使 也

C.就 要是 那就

D.就 即使 也

单项选择题

A study released a little over a week ago, which found that eldest children end up, on average, with slightly higher IQ’s than younger siblings, was a reminder that the fight for self- definition starts much earlier than freshman year. Families, whatever the relative intelligence of their members, often treat the firstborn as if he or she were the most academic, and the younger siblings fill in other niches: the wild one, the flirt.

These imposed caricatures, in combination with the other labels that accumulate from the sandbox through adolescence, can seem over time like a miserable entourage of identities that can be silenced only with hours of therapy. But there’s another way to see these alternate identities: as challenges that can sharpen psychological skills. In a country where reinvention is considered a birthright, many people seem to treat old identities the way Houdini treated padlocked boxes: something to wriggle free from, before being dragged down. And psychological research suggests that this ability can be a sign of mental resilience, of taking control of your own story rather than being trapped by it.

The late-night bull sessions in college or at backyard barbecues are at some level like out-of-body experiences, allowing a re-coloring of past experience to connect with new acquaintances. A more obvious outlet to expand identity--and one that’s available to those who have not or cannot escape the family and community where they’re known and labeled-- is the Internet. Admittedly, a lot of the role-playing on the Internet can have a deviant quality. But researchers have found that many people who play life-simulation games, for example, set up the kind of families they would like to have had, even script alternate versions of their own role in the family or in a peer group.

Decades ago the psychologist Erik Erickson conceived of middle age as a stage of life defined by a tension between stagnation and generativity-a healthy sense of guiding and nourishing the next generation, of helping the community. Ina series of studies, the Northwestern psychologist Dan P. McAdams has found that adults in their 40s and 50s whose lives show this generous quality - who often volunteer, who have a sense of accomplishment - tell very similar stories about how they came to be who they are. Whether they grew up in rural poverty or with views of Central Park, they told their life stories as series of redemptive lessons. When they failed a grade, they found a wonderful tutor, and later made the honor roll; when fired from a good job, they were forced to start their own business.

This similarity in narrative constructions most likely reflects some agency, a willful reshaping and re-imagining of the past that informs the present. These are people who, whether pegged as nerds or rebels or plodders, have taken control of the stories that form their identities.

In conversation, people are often willing to hand out thumbnail descriptions of themselves: "I’m kind of a hermit. " Or a talker, a practical joker, a striver, a snob, a morning person. But they are more likely to wince when someone else describes them so authoritatively.

Maybe that’s because they have come too far, shaken off enough old labels already. Like escape artists with a lifetime’s experience slipping through chains, they don’t want or need any additional work. Because while most people can leave their family niches, schoolyard nicknames and high school reputations behind, they don’t ever entirely forget them.

The author mentioned Houdini in the text to()

A. tell readers how he treated the padlocked boxes

B. introduce the topic of IQ differences between siblings

C. illustrate the point that previous identities can be remade

D. explain how to sharpen one’s psychological skills