题干

方程x2-4=0的根是(     )

A:2

B:-2

C:2或-2

D:以上都不对

上一题 下一题 0.0难度 选择题 更新时间:2019-11-11 12:23:21

答案(点此获取答案解析)

C

同类题4

阅读理解

    Getting on the school bus, like the possible dangers around the home, getting on the school bus can also bring its own set of dangers. There are several important safety measures that parents should be aware of when it comes to bus safety.

    Parents should always make sure that someone is taking charge of children at the bus stop to make certain clear ground rules which are in place and are being followed—particularly rules that forbid horseplay in and around the street.

    Teach children to ask the bus driver for help in picking up anything they may have dropped around the bus, as children getting dropped articles are often hit by the bus or another vehicle because they are not seen by the bus driver or by oncoming traffic.

    Children should be asked to take five large steps away from the bus when they get it off, and make sure that the bus driver can see you and look you directly in the eyes to signal it is OK to cross the street. It is still very important that children also look both ways as they cross the street.

    Inform children that they must never speak to any stranger who talks with them first and that they must never accept a ride from any person unless their parents tell them directly that it is OK. Teach kids that adults should ask other adults for help, not kids. If an adult asks a kid for help, that child should get another adult.

    If for any reason a child feels uncomfortable or unsafe at the bus stop they need to bring it to a parent's or caregiver's attention.

Remember, planning ahead is always the best safety measure. Follow these rules and your family will be off danger!

同类题5

阅读下文,回答问题

       “妈妈,人会死吗?人既然要死,那活着有啥意义呢?”从去年年底开始,湖南株洲七岁的倩倩(化名)就一直缠着妈妈问这样一个“深奥”的难题。近日,她妈妈以“千千妈妈”的网名在网上发帖求助,因为实在“无法给女儿一个恰当的解释和答案”。

       相信“千千妈妈”的遭遇很多人都经历过。当孩子一个劲儿地追问我们“人为什么要活着”“活着有啥意义”等问题的时候,说明孩子的生命主体意识在悄悄觉醒,已经开始正视生命、思考生命,而此时正是我们对孩子进行生命教育的最佳契机。联想起近年来屡见报端的校园伤人和自杀事件,对我们的社会、学校、家庭来说,生命教育更是刻不容缓的事情。

       生命教育本该是贯穿孩子成长过程中的一件大事。在一些国家和地区,生命教育不仅早就纳入中小学课程,而且内容丰富,形式活泼。比如,在瑞典,老师会一边让孩子们轻抚孕妇凸起的腹部,一边给他们介绍胎儿的孕育过程,讲述生命的诞生和死亡,解释生命的来之不易,引发孩子们思考人生的价值、生活的意义。还有一些国家的孩子,每学期要有一天戴毛玻璃眼镜在学校体验盲人看不见的感觉,还有一天戴耳塞体验聋人听不见的痛苦。这样做,不仅让孩子深切体会到两个感官之于生命的重要,更让他们感同身受地理解残疾人的处境,培育对生命的敬重和呵护。

       然而长期以来,受应试教育的束缚,我们整个社会已经形成了重知识灌输轻人文培养,重素质教育轻生命教育的局面。在学生伤人或自杀诸多事实面前,许多心理学家认为,现在的学生心理承受能力、抗挫折能力及面对困难的勇气不够,看问题容易绝对偏激;他们敏于思索却不肯轻易表露,有独到的见解但不愿开口,想接受指导又不愿虚心求教,内心时时矛盾常常纠结,甚至出现自我封闭或半封闭状态。一旦遇到挫折打击,他们往往难以承受,于是就会发生一些遗憾的事,甚至产生一个个悲剧。这些都是生命教育缺失的结果。

       十年树木,百年树人。提倡生命教育,不仅是人类本身的重大话题,更是对教育本质的深入探究,其目的不单单在于让孩子们认识生命的本质,更是为了让他们理解生命的意义,热爱自己的生命,尊重他人的生命,感悟生活中的美好,追求人生的幸福。

﹣﹣2013年4月10日《湘潭日报》(有删改)