题干

蚕豆种子中,可以发育成新植物体的结构是(      )

A:种皮

B:胚  

C:胚乳

D:子叶

上一题 下一题 0.0难度 选择题 更新时间:2017-06-01 12:12:41

答案(点此获取答案解析)

B

同类题1

阅读理解

该不该让家长陪读

    【编者按】陪读,顾名思义就是陪同孩子读书。广义上讲是家长全程参与孩子生活与 学习的一种行为。狭义上讲是孩子放学后家长或陪读老师陪同孩子写作业并予以指导的行为。现在家长陪读已经成为一种风气。有的在县城的学校附近租房子陪读,有的跨学区买房陪读,还有的甚至飘洋过海去陪读。该不该让家长陪读呢?我们选取了三位同学的发言来讨论这个问题。

     “孟母三迁”是我们熟悉的千古佳话,这也许是有记载的最早的陪读吧。孟母努力为 孟子营造良好的学习环境,值得天下父母效仿。有人说:“父母应当成为孩子成长路上的导师,生活中的朋友,学习中的伙伴。”这句话将父母对孩子的重要性概括得很全面。确实如此,我们如果与父母一起生活,父母良好的品行修养会潜移默化地影响我们。现在,很多学校实行寄宿制,家长与孩子相处的时间很少,陪读就能增加与孩子相聚的时光,减少父母的“空巢”感,提高家庭的和谐幸福指数。另外,很多孩子学***,父母陪读能缓解孩子压力,激发孩子学习动力。①___________

——(广东)刘同学

    首先,家长陪读不利于孩子生活自理能力的培养。很多陪读家长甚至连盛饭、洗袜 子、挤牙膏这样的小事都代劳,如此陪读会导致孩子“高分低能”。其次,孩子在成长道 路上难免会遇到这样那样的麻烦和困难,如果每次家长都在身边给予“帮助”,这些麻 烦、困难对于孩子来讲就失去了助其成长的意义,久而久之,会让孩子形成依赖心理。近年来社会上热议的“啃老族”,不就是被父母一路“包办”成长的精神上的矮子吗?最后,家长也有自己的生活和工作。家长如果在自己的工作中做出了成绩,无疑会对孩子产 生积极的影响;反之,如果他们把孩子当作全部,放弃了事业和追求,可能就无法有效地 “言传身教”了。不可否认,不少家长陪读也是出于无奈。但问题是,今天在重重保护下长大的我们,未来有能力去保护自己的孩子吗?②___________

——(河南)李同学

    家长陪读的重点应放在“读”上,而不仅仅放在“陪”上。要“读”懂孩子,理解孩子,摆正自己“陪”的位置,而不是变成管孩子吃饭,管孩子学习,管孩子交友,管孩子看电视、电脑。我的父母陪读就很讲究方法,有艺术。我到家后,他们不光嘘寒问暖,还留出时间让我给他们讲述一天的情况,等我自己作出评价后,他们才会恰当地说出他们的见解。遇到双休日,不是他们“伺候”我,而是我孝敬他们。这使得我们之间有了更多的情感交流,就像并肩作战的战友。我们年纪小,有父母在身边,我们快乐无忧,父母心里踏实。③___________

——(浙江)张同学

(节选自《中学生阅读》,有删改)

同类题5

阅读理解

       Does stress cause gray hair?Many people believe that tension and stress can cause your hair to lose its color.In fact,it is an_old_wives’_tale that being upset all the time can result in premature graying.Here is a closer look at this situation and why some believe that this old wives’ tale could be true.

       As one ages,the hairs on the head also age.In fact,just about everything on the human body begins to show signs of wear and tear after a while.The joints wear and become stiff and skin wears and becomes wrinkled.Hairs on the head grow and eventually die.They are replaced,but in the process something else happens.

      When new hairs are replaced,the color or pigment (色素) is also added to them.However,as one ages,this pigment becomes less and less available.At first,hairs will have a limited amount of pigment and they will appear to be grayish in color.In time,they will lose all of their pigment and will be white.Many things are known to cause graying,and genetics is a very powerful factor.If one of your parents turns gray at an early age,there is a good chance that you will too.Some people begin the graying process in high school,while others may be over the age of forty.

      Constant worry and tension can have many harmful effects on the human body.It is a known fact that stressful times can cause one to suffer hair loss.It would make sense that if it can cause these problems,perhaps it also may contribute to graying.However,there is no sound evidence to support this.

       On the other hand,many medical professionals believe that there may be a link between graying and a constant state of anxiety or tension.Does stress cause gray hair?There is no scientific evidence to support the theory,but it is best to avoid stressful situations.