题干

南极洲上有丰富的煤炭资源,煤的形成需要有暖湿的环境与大片的森林,而南极洲上冰天雪地,号称“白色沙漠”,为什么会有此现象产生(    )

A:南极地区曾经气候温暖湿润

B:人类发展生产运输来的

C:南极洲是从温暖地区漂移来的

D:植被具有迁徙的能力

上一题 下一题 0.0难度 选择题 更新时间:2019-04-11 09:40:10

答案(点此获取答案解析)

C

同类题1

完形填空

    Whenever Michael Carl, the fashion market director at Vanity Fair, goes out to dinner with friends, he plays something called the “phone stack” game: Everyone1 their phones in the middle of the table; whoever looks at their device before the check arrives 2for dinner.

    Brandon Holley, the former editor of Lucky magazine, had trouble 3 her iPhone when she got home from work. So about six months ago, she 4putting her phone into a milk tin the moment she walked in. It remains there until after dinner. And Marc Jacobs, the fashion designer, didn't 5 to sleep close to a beeping gadget. So, he6_digital devices from his bedroom—a house rule he 7 with audiences during a recent screening of Disconnect, a film that dramatizes how technology has alienated(使疏远) people from one another.

    As smartphones 8to make their way into our lives, and wearable devices like Google Glass9 our personal space even further, overtaxed users are exploring their own device-free zones. Whether it's a physical barrier(no iPads at the dinner table) or a conceptual one (turn off devices by 11 p.m.), users say these disconnecting 10 are improving their relationships---and11their brains.

    “Disconnecting is a luxury that we all12,” said Lesley M. M. Blume, a New York writer who keeps her phone away from the dinner table at home. “The expectation that we must always be13to employers, colleagues and family creates a real obstacle in trying to 14private time. But that private time is more important than ever.”

    A popular method for disconnecting is to choose a box for your cellphone, like the milk tin that MS. Holley uses. “15my phone is buzzing or lighting up, it's still a distraction, so it16in the box.” said Ms. Holley. Others choose new17 “No screens after 11 p. m.” said Ari. Melber, a TV host. “We found the evenings were more 18and we were sleeping better.” he added.

    Sleeping is a big factor, which is why some 19 to leave their phones out of their bedrooms. “I don't want to sleep next to something full of phones and emails.” said Peter Som, a fashion designer, who keeps his phone charging in the living room overnight. “It 20is a head-clearer and distinguishes daytime and sleep time.”

同类题3

阅读下文,回答问题。

拔掉心底的篱笆

    我小时候学习成绩不错,但不知从哪儿听来的;一个人如果学习成绩优秀,那么他在体育方面多半会很差。另外,我常常感冒,这让我更加确信我是个体质弱的人,不适合竞技类的运动项目。

    有一次学校举办运动会,我很想报名田径比赛,但你知道,我是不会报的。

    那天体育老师找到我:你怎么没报项目?我把心底的担忧倒了出来。体育老师的话,刷新了我小时候的“常识”:你错了,人都会感冒,不时地感冒一次,恰恰证明你的免疫系统是敏感且运转正常的,反倒可能说明你体质好;跑步是可以练出来的,也许你在耐劳方面出色,来试试吧!

    你完全能想象当时有多高兴,猛然发现自己的先天条件并无缺陷,甚至有优势,那些被我看得比山还重的束缚,仅仅是因为过去的我孤陋寡闻。

    我最终报名参加了长度最长的长跑比赛,拿了第三名。

    高中二时,学校文理分科。从小到大,我的数学成绩没有语文成绩好,虽然也不低,师长们多年来在耳边不停提醒我:你数学需要提高啊!你偏科啦!我渐渐也承认了这个现实:我脑子不灵,于是我报了文科班,但依旧对数学这一科怕得要死。分科之后,教我们数学的是当地名声赫赫的泰斗级老师。

    有一次他问我:你成绩那么好?为什么不把数学也兼顾一下呢?我说:老师,我从小数学就偏科,我不擅长学数学。

    他接下来的一番话刷新了我读高中时的“常识”:你错了,咱们现在学的内容跟以前的知识并没太大联系,从前学得不好,现在可能学得好;你刚刚的表达不准确,什么叫“我不擅长数学”?数学领域分为代数、几何,等好多部分,涉及的能力有人的空间想象能力、逻辑思维能力等,我看你的逻辑能力就很强,可能擅长数学中的一部分。

    我听到这话别提多高兴,感觉整个人都解放了:原来,“科学表明”,我在数学领域不但不是废物,而且非常“有戏”。那学期的考试,数学满分值150,我拿了142分。

    参加工作后,一位读者朋友过了不惑之年,想学外语,但恐于年龄大学不成,问我怎么办。说实话,我没法盲目地激励他。众所周知,人岁数一大,大脑会退化。后来,我偶然看到这样一则消息:最新研究结果显示,中老年人计算速度及注意力方面确实下降了,但脑细胞丝毫没减少,在模式识别、逻辑推理方面不降反增,年纪大了也不存在“舌头变硬学发音会吃力”这一说。我赶紧把这喜讯告诉他,他像我小时候一样欢喜,如今已经学有小成了。

    人的和你多恐惧和心理障碍,都是自己强加给自己的,抑或是早年间被别人在脑海里围起来的篱笆。你经历得越多,知道得越多,就越有可能发现很多自己以前觉得是问题的地方其实都是不问题。另一个方面,可能这世上从来就不存在什么难以逾越的篱笆,有时候,脚下的障碍其实是一排娇弱的花

(摘自《青年文摘》有删改)