题干

将某绿色植物放在特定的实验装置中,研究温度对光合作用与呼吸作用的影响(其他实验条件都是理想的),实验以CO2的吸收量与释放量为指标.实验结果如下表所示:

温度(℃)

5

10

15

20

25

30

35

光照下吸收CO2(mg/h)

1.00

1.75

2.50

3.25

3.75

3.50

3.00

黑暗中释放CO2 (mg/h)

0.50

0.75

1.00

1.50

2.25

3.00

3.50

下列对该表数据分析正确的是(    )

A:昼夜不停地光照,在35℃时该植物不能生长

B:昼夜不停地光照,在15℃时该植物生长得最快

C:每天交替进行12小时光照、12小时黑暗,在20℃时该植物积累的有机物最多

D:每天交替进行12小时光照、12小时黑暗,在30℃时该植物积累的有机物是在10℃时的2倍

上一题 下一题 0.0难度 选择题 更新时间:2018-04-21 11:59:24

答案(点此获取答案解析)

C

同类题1

阅读下面的文字,完成小题。

       ①改革开放30多年来,我国经济发展成就举世瞩目,但发展的高碳特征也非常明显。高碳不仅加剧气候变暖,而且与污染有强相关性。今天我们已认识到,光讲发展是不够的,还要讲发展方式、选好发展路径。如果中西部地区沿袭东部一些地区过去的发展路径,我国经济发展就会更高碳。为了可持续的未来,我国转向低碳发展已刻不容缓。

       ②从能源经济学的角度看,发达国家可分成两类:一类是美国、加拿大等国家,现在年人均能耗近10吨标准煤;另一类是欧洲和日本等国家,现在年人均能耗是5吨标准煤左右。两类国家人均能耗相差一倍之多,而人均碳排放相差还不止一倍。一些人经常以美国的发展为标准,但如果世界其他国家都达到美国那样的人均能耗水平,那就得4个地球才能养活人类。所以,美国这种高能耗发展模式是不能模仿、不可推广的。对我国来说,控制总量,坚持高效、洁净、低碳,是低碳发展非常重要的内涵。可再生能源、核能、天然气是低碳能源的“三匹马”,它们之间的关系不是相互排斥的,而是需要并驾齐驱、形成合力。惟有如此,才能更多地替代煤炭。

       ③在我国,目前已有许多低碳发展方面的实践。近些年,我国产业结构调整力度很 大,淘汰落后产能也取得了一定成效。“十一五”期间,我国能源强度下降19.1%,2014年碳强度下降5%;工业余热替代北方传统供暖规模试点成功;低碳城市试点初见成效;等等。低碳发展使经济增长更理性、质量效益更高。所以,国际和国内的实践都表明:低碳发展之路可以通向现代化。低碳发展以一种新的经济增长方式重塑经济,实现高质量、高效益的发展。走低碳发展之路,既是为了应对气候变化,更是为了国家和人类的可持续发展。

       ④事实上,低碳发展不仅会促进经济发展方式转变,还会带来社会治理和人们思想观念的深刻变革,促进形成低碳社会。低碳社会的基础是城乡一个个低碳“细胞”,包括低碳社区、低碳企业、低碳乡村、低碳家庭等。如果每个“细胞”都能达到低碳水平,就会带来社会治理、公民素质、人们生活方式和思想观念的深刻变革,意义非常重大。我国是人口大国,自然也是生产和生活废弃物排放大国。废弃物不是无用的东西,而是放错了位置的资源。废弃物减量化和资源化利用具有可行性,可以带来巨大的环境、经济和社会效益,是低碳社会中意义重大的新兴产业,是建设美丽中国的基础性产业。废弃物分类资源化利用能不能实现,又与人们的生活方式和生活理念有很大关系。所以,走低碳发展之路,需要人人参与。

       ⑤当今世界,无论发达国家还是发展中国家,都在努力转向绿色低碳发展。这是一个总趋势,也可以说是一场竞赛。在这场竞赛中,我国不能落伍,而必须尽快抢占新的战略制高点,切实迈向生态文明。

同类题5

阅读理解
    If your child constantly moves when he's doing math homework or insists on listening to music while studying, take heart. Although it may seem like he's trying to drive you crazy, he's probably just using the strategies that help him learn.
    “I like to study at a desk in silence, and my daughter can't think that way. She likes to bounce around on a ball with music in the background,” says author Maureen McKay, whose website, Optimistic Outcomes, provides tips based on a child's learning style for parents. “Sometimes kids are just doing what works for them.”
    Three basic learning styles are auditory, kinesthetic(肌肉运动知觉的), and visual ones. Auditory learners prefer listening to explanations to reading them and may like to study by reciting information aloud. This type of learner may want to have background music while studying, or they may be distracted by noises and need a quiet environment to study. Kinesthetic learners learn by doing and touching something. They may have trouble sitting still while studying, and they are better able to understand information by writing it down or doing hands-on activities. Visual learners process new information by reading, looking at graphics, or watching a demonstration. Children with this learning style can grasp information presented in a chart or graph, but they may grow impatient listening to an explanation.
    Most people use a combination of styles but have a clear preference for one. Understanding your child's learning style can reduce homework frustrations and make it easier for families to communicate, says McKay. She observed different learning styles while working as a teacher's assistant, and she started researching strategies for working in different learning styles when her daughter began having trouble in elementary school.
    Because her daughter had difficulty listening in class, McKay looked for exercises to strengthen listening skills. Her daughter is now doing well in middle school, and she owes her success to the fact that her teachers and parents came to understand her unique style of learning.
根据短文内容,选择最佳答案,并将选定答案的字母标号填在题前括号内。