题干

二氧化碳虽然只约占空气总体积的0.03%,但对动植物的生命活动起着极为重要的作用。自然界中二氧化碳的循环如右图所示,下列过程放在X处不合理的是(   )

A:人和动物的呼吸

B:利用太阳能发电

C:化石燃料的燃烧

D:植物的呼吸作用

上一题 下一题 0.0难度 选择题 更新时间:2018-06-03 04:38:46

答案(点此获取答案解析)

B

同类题2

选择合适的选项补全短文。

    A class teacher, in my opinion, plays an important role in a child's development.____ This year, she is moving to Class Three and I can't wait to see how things are going on.

    Last year, my daughter did not like her teacher at all. It was so bad that she did not look forward to school. It was a year full of trouble and that worries.

   This year, Miss Purity is gentle and humorous. It's hard not to like her.____.

    She becomes an early bird. Last year, mornings were like a fight because I had to force Tasha to hurry up when she was preparing for school. I had to pull her out of bed, tell her to take breakfast and then drove her to school. But now, our mornings are like a party. She wakes up early, prepares everything at a high speed and then rushes to school to be with Miss Purity.

    She's happy. She enjoys school and school work and keeps talking about what they did at school when she comes home.

    She's responsible.____ But now she never forgets even her water bottle at school. She makes her bed and helps in the kitchen.

    Her diary is full of praises. The diary is the tool of communication between the teacher and the parents. Last year, her diary was always full of negative reports. One time, she poured water in a child's lunchbox, another time she threw another kid's textbook in the toilet.____ She's always volunteering to clean the blackboard, the teacher's chair and desk.

    ____ Finishing her classwork was such a big problem. She had to do it at home. But now, she finished both the classwork and homework at school.

A. Here are the changes in my daughter.

B. Now she began to share her snacks with those who did not have anything.

C. Every year when my daughter moves to a new class, I have a usual big worry—her new class teacher.

D. Her diary was good.

E. She has a good class teacher.

F. She used to be careless and forgetful.

G. She does well in school.

同类题3

党的十八届五中全会提出实现“十三五”发展目标,必须牢固树立并切实贯彻创新、协调、绿色、开放、共享五大发展理念,其中创新是引领发展的第一动力,必须把创新摆在国家发展的核心位置,为了提高中学生科技创新意识和能力,九年级(三)班召开了“科技创新,从我做起”的主题班会,相关流程如下:

第一步:收集信息

第二步:班主任展示九年级(三)班同学收集的部分材料

材料一:2015年11月16日,全球超级计算机500强榜单在美国公布;由我国国防科技大学研制的“天河二号”超级计算机以每秒33.86千万亿次连续第六次位居世界超算500强榜首,获得“六连冠”殊荣,这也是世界超算史上第一台实现六连冠的超级计算机,创造了世界超算史上连续第一的新纪录。

材料二:2015年10月,屠呦呦获得诺贝尔生理学或医学奖.理由是她发现了青蒿素,这种药品可以有效降低疟疾患者的死亡率.她成为首位获得科学类诺贝尔奖的中国人,是中国医学界迄今为止获得的最高奖项,也是中医药成果获得的最高奖项。

材料三:我国对外技术依存度高达50%,而美国、riben仅为5%左右.特别是关键技术自给率低,我国占固定资产投资40%左右的设备投资中,有60%以上要靠进口来满足,高科技含量的关键装备基本依赖进口.而在重点领域特别是国防领域的对外技术依赖,会对国家安全构成严峻挑战.万人专利拥有量美国1760件,德国1750件,日本1500件,中国10件。

第三步:联系教材,知识抢答

第四步:我励志、我参与