题干

某生物小组的同学在玻璃温室内进行植物栽培实验,为此他们对室内空气中的二氧化碳含量进行24小时测定,下图曲线能正确表示其测定结果的是(横坐标为日时间,纵坐标为二氧化碳浓度)(    )

A:

B:

C:

D:

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C

同类题1

改革是强国之路。面对危机,只有接受变革,国家才有可能生存和发展。请阅读以下材料,回答问题。

材料一:工业革命一旦在某个国家开始,现代化的压力就形成了,迫使与它相邻的所有国家紧紧跟上 ……现代化在动荡中迅猛推进……对被侵略地区而言,问题表现得越来越清楚:它原有的文明难以抵御欧洲国家的入侵……从19世纪中叶开始,现代化跃出欧洲,向亚非大陆推进。——摘编自钱乘旦《世界现代化历程》

材料二:克里米亚的失败对俄罗斯的民族主义者的斯拉夫派来说是一个严重打击,……实际上,这场失败暴露了旧制度的腐败和落后。——斯塔夫•里•阿诺斯《全球通史》

材料三:为了保持俄罗斯的大国地位,沙皇政府着手开始了一项改革计划。 ……社会改革为社会发起的工业化进程铺平了道路,使俄罗斯社会在十九世纪最后十年发生转型。                   ——杰里•齐格勒《新全球史》(第三版)下

材料四:横须贺,位于东京湾入口,日本近代史就是从这里开始的。2003年,这座依山傍水、清秀怡人的小城举行了一次盛大的纪念活动,被纪念的是一位美国将军。……人们很难想象,150年前,正是这位将军用武力迫使日本打开了自己的国门,让这个岛国走上了一段充斥着悲剧和奇迹、混杂着屈服和刚强的历史。——《大国崛起》

材料五:在短短的几十年里,日本就按自己的节奏改变了自身,以前它是个前工业时代的封建社会,到19世纪末,新日本——西方影响和日本传统的混合物——成为一个正在上升的帝国。它很快将成为西方一个可怕的竞争对手。——《全球视野下的西方文明史》

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同类题2

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    Last weekend, I was blessed with an opportunity to serve as a volunteer in Maryland. I don't have a car and the closest Amtrak station is about 30 minutes away from the actual site so I wasn't sure1I would get there. I started thinking that maybe it wouldn't be2and after a really long week, I thought that maybe I shouldn't3at all. But I went ahead and posted a request for a4on the ride-share board.

    A few days later, an individual I had never met5that he would be able to pick me up and6me off at the station. He was also planning on serving but said he would wait7my train arrived before driving out there. How kind8this person whom I've never even met, I thought to myself. My heart9, and the stress I had been feeling from my week10away.

    When my new friend drove me to the train station, he11that it was in a deserted kind of area. There was no one12around. It was cold outside, and I still had 30 minutes to wait. So he13his car and said, “We will wait for the train to come together.”

    I couldn't believe his compassion and14. I knew that he had to be at work the next day15me, and that his wife and son were waiting for his return. But he just waited there with me so16, generously serving with his time.

    With five minutes17before the train arrived, he shared with me stories from his childhood. As a young boy, he18sit near the edge of the train tracks, excitedly waiting for the trains to rush by with all their force. That night, before returning home to his family, he waited with me as my train19. It didn't rush by at full force but I left that station20the full force of his compassion and generosity.