题干

下列现象主要由地球自转产生的是(  )

A:春、夏、秋、冬四季的变化

B:夏季日出时间比冬季早

C:山东的学生通常比新疆的学生上课时间早

D:地球上五带的形成

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答案(点此获取答案解析)

C

同类题1

阅读下面的文章,完成小题目。

遗璞

贾平凹

    离公路很远的地方,有条山沟。再往深里走,有座古庙,庙前的河滩里,有一块石头:四间房那么高,像一只实心碗儿放着。上边凿了四个大字:孕璜遗璞。

    住在这孕璜遗璞周围的人家,就是遗璞村。

    县志上说:这石头,是当年女娲补天的时候多了一块,就遗弃在这里再没有用。人们都在传说,这石头孕了玉璜,是仙灵之物,于是时常有人前来观赏,遗璞村的人便祖祖辈辈自豪。

    收罢秋,天气转凉了。沟脑上边要修一道水渠,把水引到山坡下的地里,男人们都去辛苦了,丁丁当当在远处破石头。夜里回来,便坐在碾盘上吃饭,然后就熬了山上自采的野茶。这茶很苦,一天三顿都要喝,不喝脑壳就疼。一喝着,身上来了精神,他们就笑话山外来观赏遗璞的那些人:

    “城里人没采,一喝这茶就吐了。”

    “城里人胃嫩。”

    “鸡鸭都克得过,这茶水儿却受不了?!”

    他们说过,就乐了,接着就看起河滩里的那块遗璞来。

    “这么个仙物儿,遗在这里真委屈了。”

    “多亏就遗弃了它!”

    “多亏?”

    “它要不在这儿,谁会到咱这儿?省城在天尽头,咱能去吗?但咱坐在家门口,倒见着省城大人物了。”

    说的是省城老贾的事儿。

    省城老贾是七年前在这里呆过的。那时候,村里人发现从县里来了个胖胖的老头,白日里也上山劳动,夜里就在石头前闷头儿坐一阵。他们都不知道这是谁,后来才风闻是犯了错误,从省城来的人,姓贾。就叫起他省城老贾。

    一年后,省城老贾就在县里当了书记,他们才知道那是个当官的人物,遗璞村老少都很骄傲。省城老贾也没忘了这遗璞和遗璞村的人,过一些日子,就来看看石头,又给这个村拨了好多救济粮、救济款。有一年每家得到十二元,一半买了粮食,一半给孩子们买了塑料凉鞋。到山外去的时候,孩子们就穿上塑料凉鞋,式样挺漂亮的,只是穿长了脚发烧,走一走得用凉水浇。去年秋初,省城老贾突然回省城去了,临走前他照了好多遗璞的照片,还说回去后,要为这石头写写文章哩。不久,他就在省城当了一个很大的官。遗璞村的人愈是十分地骄傲了。

    “那文章不知写了没有?”

    “他现在怕忙了呢!”

    男人们在碾盘上说话,婆娘家觉得热闹,也走了过来。女人在石头上坐了,一直不开口,这会儿说:

    “蛮儿说,他在报上看到省城老贾的文章了。”

    “写咱遗璞村了吗?”

    “写了。说‘四人帮’迫害他,把他‘流放’,‘流放’是什么意思?”

    “就是下放吧。”

    “‘流放’到一个山区小县,而且还在一个山沟沟劳改了一年。”

    “你胡说了,他住在咱这儿,没有背枪的看守他,苦是苦些,和咱们一样,咱又处处照顾了他,你说他劳改了一年,咱们不是长年在劳改吗?”

    “蛮儿说报上就这么写的。”

    “蛮儿一定是看错了。你们婆娘家这臭嘴!”

    婆娘家便不再言语了,低声骂了一句怀里用牙咬奶的孩子。

    男人们喝过一杯黑糊糊的茶水,又说开了:

    “咱这块遗璞,真是好石头呢!想想,招来多少人了?不算一般的,大人物就有十多个了吧?”

    他们扳指头数数,果然十多个了。

    “以后还能来吗?”

    “只要有咱这块石头,就有人来吧,说不定以后还会来比省城老贾更大的人呢。”

    “啊,那该好,娃们又要有凉鞋穿了!”

    “但愿他们能来。”

    “但愿不要是犯了什么错误。”

    “但愿……”

    茶已经喝完,就卷着喇叭纸烟抽起来,黑影里,火光一明一灭的。末了打着哈欠,还在说:“真是好石头呢。”

    但是,就在这一夜的黎明时分,河滩里响了一声爆炸声,人们都惊醒了。早晨起来,才发现是蛮儿一帮年轻人用炸药把遗璞炸开了,又用铁钎大锤在黑水汗流地砸着,破着,就把石头一块块抬着到水渠工地上去了。

(有删节)

同类题3

阅读理解

    Who could have imagined that a treadmill(跑步机)on wheels would one day become a thing? Lopifit is an unusual means of transportation that allows you to power an electric bicycle by walking on a treadmill.

    Lopifit founder Bruin Bergmeester says it all started when he asked himself the question. "How can I use a treadmill outdoors?" He eventually came up with a design, to which he added an electric engine, and Lopifit was born. The treadmill bicycle is similar to a typical electric bicycle in that the motor only works when the rider puts power in as well. The Lopifit senses it when you walk on the treadmill and uses the motor to turn a drive chain at the back part of the treadmill, helping you reach a top speed of 17 miles per hour.

    To use the Lopifit, simply turn on the battery and use your feet to slide the treadmill backwards and activate (激活) the motor. Then get on and enjoy the ride! If you need speed, just walk on the treadmill, and if you want to coast, all you have to do is stay still and admire the view. To stop, you have two hand brakes available.

    The Lopifit first hit the streets in 2014 and, unsurprisingly, became an instant hit. That was actually quite challenging for the company, because it started get inquiries and calls for orders, but it was nowhere near ready for mass production. The unique treadmill bicycle became available this year, and Lopifit is struggling to keep up with demand, despite the high price tag of $ 2,115.

    But despite having a very loyal fan-base of so-called Lopifitters, the creative means of transportation also has naysayers who simply consider the invention stupid and unnecessary. They basically believe that if you're going to walk, you might as well do it the old-fashioned way. But the Lopifit does have the unique advantage of helping you walk really fast without breaking a sweat, or walking at cycling speed, if you will.