题干

下图为环境、资源和人口关系示意图,有关图中甲、乙、丙、丁含义的叙述,正确的是(    )

A:甲表示资源         

B:乙表示人口

C:丙表示环境

D:丁表示经济系统

上一题 下一题 0.0难度 选择题 更新时间:2018-11-13 07:12:35

答案(点此获取答案解析)

C,D

同类题2

阅读理解

    Look at the light and beautiful snowflakes (雪花) falling. Ever wanted to hold them in your hands? They are always lost when they meet your hands.

    Well, this isn't just a problem for you. It was a problem for Wilson Bentley, too. In the 1870s, Wilson Bentley was just a teenager. His family lived in a small town in northeast America. Winters there were long and hard. Bentley's mother was once a school teacher. She taught him at home. Bentley didn't go to school until he was 14. He was a quiet boy, and loved reading his mother's books. But he was interested in his mother's microscope (显微镜). When the other boys were playing with balls, little Bentley was studying things like drops of water, flowers and snowflakes.     

    Bentley loved watching snowflakes. For the next two years, young Bentley spent many winter days in a cold room watching these ice crystals (晶体) under his microscope. The boy thought they were beautiful enough for him to start to draw pictures of them. But there were so many snowflakes that he couldn't draw them all.

    How could he keep their beauty all the time? Bentley thought of buying a camera.

    The boy and his mother asked his father to buy one. But, his father didn't agree. He thought the whole thing was a bad idea. He thought the only thing a farmer should do was farming.

    But finally Bentley did get a camera. For more than a year he tried to take pictures of snowflakes. On January 15, 1885, during a snowstorm, Bentley took the first ever photo of an ice crystal with his camera. “It was the greatest moment of my life,” Bentley said later.

    For 13 years, Bentley worked quietly and took thousands of photos of ice crystals. Later he became famous as “Snowflake” Bentley.

同类题3

阅读下面的文言文,完成文后各题。

    杜范,字成之,黄岩人。少从其从祖烨、知仁游,从祖受学朱熹,至范益著。嘉定元年举进士,调金坛尉,再调婺州司法。绍定三年,主管户部架阁文字。六年,迁大理司直。改秘书郎,寻拜监察御史。奏:“曩者权臣所用台谏,必其私人,约言已坚,而后出命。其所弹击,悉承风旨,是以纪纲荡然,风俗大坏。陛下亲政,首用洪咨夔、王遂,痛矫宿弊,斥去奸邪。”理宗深然之。

    嘉熙二年,差知宁国府。明年至郡,适大旱,范即以便宜发常平粟,又劝寓公富人有积粟者发之,民赖以安。始至仓库多空未几米余十万斛钱亦数万悉以代输下户粮。两淮饥民渡江者多剽掠,其首张世显尤勇悍,拥众三千余人至城外。范遣人犒之,俾勿扰以俟处分,世显乃阴有窥城之意。范以计擒斩之,给其众使归。

    淳祐二年,擢同签书枢密院事。范既入都堂,凡行事有得失,除授有是非,悉抗言无隐情。丞相史嵩之外示宽容,内实忌之。四年,迁同知枢密院事。以李鸣复参知政事,范不屑与鸣复共政,去之。帝遣中使召回,且敕诸城门不得出范。太学诸生亦上书留范而斥鸣复,并斥嵩之。嵩之令谏议大夫刘晋之等论范及鸣复,范遂行。会嵩之遭丧谋起复不果。于是拜范右丞相,范以逊游似,不许,遂力疾入觐。帝亲书“开诚心,布公道,集众思。广忠益”赐之。

    时孟珙权重兵久居上流,朝廷素疑其难制,至是以书来贺。范复之曰:“古人谓将相调和则士豫附,自此但相与同心徇国。若以术相笼架,非范所屑为也。”珙大感服。未几,大元军大入五河,绝中流,置营栅,且以重兵缀合肥,令不得相援,为必取寿春之计。范命惟扬、鄂渚二帅各调兵东西来应,卒以捷闻。范计功行赏,莫不曲当,军士皆悦。

    未几,,赠少傅,谥清献。

(选自《宋史》,有删改)