问题 单项选择题

以下有关象素和体素的表述,正确是()

A、象素是一个二维概念。 

B、象素越小,图像的分辨率相对越差。 

C、CT图像的基本组成单元称为体素。 

D、体素实际上是象素在成像时的表现。 

E、象素是扫描层被按矩陈排列分隔的基本成像单元。 

答案

参考答案:A

阅读理解与欣赏

阅读下面的文字,完成下面问题。

烟花三月下扬州

熊召政

  ①扬州古称广陵,人们又叫它维扬。清代之前,扬州因靠着大运河,一向被誉为南北枢纽,淮左名邦。以今天的地理概念,扬州在苏北,不属江南。但古人自北方舟船而来,一入扬州,心理上便感觉到了江南。江南是以长江为界的,从这层意义上,扬州不算江南:但它处在淮河以南,属不南不北之地,且扬州的人文风气,山水风光,都是近南而远北。杜牧写扬州的诗句“二十四桥明月夜,玉人何处教吹箫”,便绝不是凛冽的北地所能产生的情境了。

  ②历史上的扬州,自隋至清一千多年间,虽屡遭兵燹,却不掩其繁华锦绣的气象。大凡一个城市,就像一个人那样,命运各异,有好有坏。扬州属于那种“贵人多难”一类,但每遭蹂躏之后,它总能顽强地恢复生气。“大难不死,必有后福”,这八字用在扬州身上,也是合适的。

  ③记载扬州古时的繁华,典籍甚多,但最好的要数清代李斗撰著的《扬州画舫录》了。杭州、苏州乃人间天堂,值得记述的盛事比扬州还要多。但无论是张岱的《西湖梦寻》还是顾禄的《桐桥倚棹录》,都不及李斗的这本书。

  ④古扬州最令人向往的地方,当在小秦淮与瘦西湖两处。其繁华、其绮丽、其风流、其温婉,《扬州画舫录》皆记述甚详。西湖之名借于杭州,秦淮之名借于南京,但前头各加一“瘦”与“小”字,便成了扬州的特色。我一直揣摩扬州人的心理,天底下那么多响亮的词儿,他们为何偏爱“瘦”与“小”呢?这两个字用之于人与事,都不是好意思。我们说“这个人长得又瘦又小”,便有点损他不堪重用;说“他专门做小事儿”,便暗含了鼠目寸光。时下有种风气,无论是给公司取名,还是为项目招商,均把名头拔得高高的。照这个理儿,瘦西湖完全可叫“大西湖”或“金西湖”,小秦淮也可叫“中国秦淮”或“银秦淮”了。古扬州城中,虽然住了不少点石成金的商人,但铜臭不掩书香,负责给山水楼台命名的,肯定还是李斗这样的秀才。这两处名字最令人寻味:西湖一瘦,幔有了尺水玲珑的味道;秦淮一小,也有了小家碧玉的感觉。如此-来,山水就成了佳丽一族,而扬州城也就格外地诗化了。

  ⑤如是,话题就回到“烟花三月下扬州”上头,知道扬州的地理与历史,就知道什么季节到扬州最好。因为没有红枫,更没有与红枫相配的壮闰逶迤的峰峦沟壑,秋老时分到扬州的意义就不走。杜牧说“秋尽江南草未凋”,未凋并不等于葳蕤,失了草木欣欣的气象。莺歌燕舞的三月却不一样:那杨柳岸畔的水国人家,那碧波深处的江花江草,园林台榭、寺观舫舟,一色儿都罩在迷离的烟雨之中。此时的扬州,那些硬硬的房屋轮廓都被朦胧的雨雾软化了下来,曲折的小巷浮漾着兰草花的幽香。湖上的画舫,禅院的钟声,每一个细节上,都把江南的文章做到了极致。

  ⑥“南朝四百八十寺,多少楼台烟雨中”,这样的句子把我们东方人的审美意趣,写得如同梦境。在三月的扬州,我们是可以寻到这种梦境的。

  ⑦为了这梦境,我曾动了烟花三月下扬州的念头。2007年,我打听何处可以雇一条船,邀二三好友于黄鹤楼下出发,一路吟诗作画,听琴-吹箫到扬州去。结果人家告诉我,现在从武.汉到扬州,根本无水路可通。后来打听到,从杭州或苏州出发,可从运河到达扬州。我又来了兴趣,让朋友去觅一只画舫。事情也未做成,其因是这一段运河虽然畅通,但除了运送货物的商船,渡客的帆舟早就绝了踪迹。

  ⑧由此我想到,坐一条船于烟雨濛濛的江上,去拜访唐代的扬州,已是完全不可能了。扬州的繁华还在,但唐代的风流不再。若有意去欣赏今日生机勃勃的扬州,只能自驾车从高速路上去了。(选自《中国小记》,有删改)

1.下列表述不符合原文意思的一项是[ ]

A.与凛冽阔大的北地气象相比,扬州城的景色显得温婉绮丽。

B.扬州在历史上虽屡经战乱,但繁华气象却并未因此颓败。

C.烟雨迷离的扬州城诗意盎然,体现了东方人的审美意趣。

D.作者以古衬今,满怀深情地赞美了今日生机勃勃的扬州。

2.文中加线处是唐诗名句,请任选两处,简要分析其在文章结构中的作用。

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3.作者在描述扬州景物时切人的角度及语言的运用都很独特,请结合第④段和第⑤段加以赏析。

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4.作者为什么说“扬州的繁华还在,但唐代的风流不再”?请联系全文作简要分析。

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填空题

Today, we’ll talk about what other effects watching TV might produce on children. Children should be (1) a lot of television, many experts and parents agree, but there is at least one circumstance when it might be beneficial: (2) . A recent study conducted by Italian researchers found that children (3) immediately preceding and during blood tests experienced less pain than children whose mothers (4) during the procedure, or children whose mothers were present but (5) .
The research, led by Carlo Brown, MD, at the University of Siena, is published in the Archives of Disease in Childhood. (6) the study. None received any type of anesthesia; the children and their mothers (7) . Both the group whose mothers attempted to distract them from the blood tests and those whose mothers simply observed reported (8) than the group who watched cartoons. For that group, the levels of pain were less and the children were better able to (9) .
One of the possible explanations is that children might have (10) during the procedures, exacerbating their perception of pain. "The higher pain level reported by children during (11) shows the difficulty mothers have in interacting positively (12) in their children’s life," the authors write.
However, they stressed that (13) still provided benefits, noting that the children would (14) during the procedures. "Indeed, children state that having their parent present (15) when in pain," say the authors.
Another possibility offered for consideration is the notion that the (16) might release pain-quelling endorphins. Endorphins, (17) produced by the pituitary gland, resemble opiates in their ability to produce analgesia and a sense of well-being. In other words, they might (18) .
In any case, the study results suggest that health workers should (19) to watch television during painful procedures (20) .