题干

下列有关空气的说法不正确的是(   )

A:空气中只含氧气和氮气

B:酸雨的产生与空气污染有关

C:二氧化碳能产生温室效应

D:拉瓦锡用定量的方法研究了空气的成分

上一题 下一题 0.0难度 选择题 更新时间:2019-04-02 06:08:42

答案(点此获取答案解析)

A

同类题2

根据短文内容, 从短文后的选项中选出能填入空白处的最佳选项。选项中有两项为多余选项。

    A major source of teen stress is school exams,and test anxiety is not uncommon.When you recognize your teen is under stress,how can parents help your teen stay calm before an exam?

    Be involved.Parents need to be involved in their teen's work. ____ What they look for is your presence­to talk,to cry,or simply to sit with them quietly.Communicate openly with your teen.Encourage your teen to express his/her worries and fears,but don't let them focus on those fears.

    Help them get organized.____ Together,you and your teen can work out a time­table in which he/she can study for what he/she knows will be on the test.

    Provide a calm setting.Help your teen set up a quiet place to study and protect his/her privacy.Give them a nutritious diet.It's important for your teen to eat a healthy,balanced diet during exam times to focus and do his/her best.____ If this happens,encourage your teen to eat light meals or sandwiches.A healthy diet,rather than junk food,is best for reducing stress.

    ____ Persuade your teenager to get some sleep and/or do something active when she needs a real break from studying.Making time for relaxation,fun,and exercise are all important in reducing stress.Help your teen balance her time so that she will feel comfortable taking time out from studying to spend time with friends or rest.

    Show a positive attitude.____Your panic,anxiety and blame contribute to your teen's pressure.Make your teen feel accepted and valued for his/her efforts.Most importantly,reassure your teen that things will be all right,no matter what the results are.

A.A parent's attitude will dictate their teen's emotions.

B.Exam stress can make some teens lose their appetite.

C.They will only make the situation worse.

D.Encourage your teen to relax.

E.The best thing is simply to listen.

F.Help your teen think about what he/she has to study and plan accordingly.

G.Your teen may also make negative comments about themselves.

同类题3

阅读材料,完成下列各题。

       清华大学历史系博士生冯立,是赫赫有名的清华“书神”。

       冯立一直保持着这样一个习惯,每读完一百本书,就要写一篇总结性的文章,从一个主题入手,或谈谈读书所得,或谈谈阅读技巧,最后还要为这一百本书评选出一个前十名的最佳榜单。《在千山万水间枕典席文》《经典的力量》《碎片化阅读时代的碎与读》……这些都是冯立写在每一个“百本大关”的感悟和总结。从大一结束时制定读书计划开始,转眼已是历史系博士二年级的他完成了第十七个一百本读书计划,仔细算一下,相当于一年读二百多本书,平均三天两本。这样的速度,恐怕绝大多数人都是望尘莫及的,更别提长期的坚持的坚持了。

       在想象中,这样一个读书“大神”不仅是上知天文下知地理的,还有可能有些“呆气”。然而在咖啡馆见面时,他与所有普通的清华同学没有什么太大的区别。蓝色的运动上衣,鼓鼓囊囊的旧书包,梳不平的头发,略微有些胖,笑眯眯的。

       当他谈及读书的缘起,也似乎有些普通。只是觉得大学过了一年有些荒废,想看看能读多少本书,没想到上大四上学期就提前完成了三年读完三百本的目标,一读就再也停不下来了。

       一开始他按照香港中文大学的大学生必读书单看了几本,很快就发现,人不可能按照书单一本一本为了达到某个目的、刷到某个成就而读书,读书时顺其自然的,一本接一本。如果你对某一本书感兴趣,可以找到相关的书来看,还可以找书中提到过的其他书来看,慢慢地就会形成自己看书的体系,找到自己搜罗好书的方式。