题干

68400000=____亿≈____亿(保留一位小数).
上一题 下一题 0.0难度 选择题 更新时间:2019-08-26 10:09:06

答案(点此获取答案解析)

0.684,0.7

同类题1

阅读下面一篇文章,完成各题。
手掌里的清凉
    树阴下,有一大一小两个孩子,大的约七岁,小的看来不到三岁。树下有几个用砖块砌起的墩子,大的孩子以砖墩当桌子趴在上面做作业,小的也拿了一截铅笔在一张纸上胡乱画着。
    他们是兄弟俩,大的孩子放了暑假,从农村到这座城市打工的父母便把兄弟俩从家里接来,与他们团聚一些时日。
    风就是一个淘气的孩子,特别爱恶作剧,越是酷热,它越是要把自己藏起来。弟弟大约是受不了那酷热,抓耳挠腮的,满脸通红,有汗水从腮上掉了下来。这时,哥哥好像变戏法一样,从树桠上拿出一把扇子。确切地说,那不是扇子,只是一小块三夹板,拿绳子绑上了一根小木棍做柄。哥哥捏着那柄一个劲地给弟弟扇着。
    哥哥扇起的风,将砖墩上的灰尘搅起,在树叶缝隙筛落的阳光的照射下,就像一绺绺舞动的火。热热的风让兄弟俩感觉不到一丝凉快。这时,哥哥两眼直直地从街的缺口处望过去,他渴望有风吹过来,可是没有。
    哥哥显得非常失落。他下意识地四处瞅着,眼光突然就落到了一个地方,那多么像一块侧立起来的池子。也许他思绪的鱼儿已游回到了家乡,他家门前有一块池塘,不管多热的天,只要坐在池塘边树下的青石墩上,将双脚伸到水里,就会有一股透心的凉从脚下一直凉到头顶。
    哥哥来到了那“侧起的池子”前,他是认识的,那是一块玻璃。下面是墙砖,玻璃有些高,他踮了踮脚,仍然够不着那玻璃。随之,他“吭哧吭哧”地搬来几块砖头,顺着墙根码起来,站在砖头上,他这下能够着了。他将双手贴在玻璃上,感觉到了阵阵凉意。
    这时,他突然想起什么,赶紧将弟弟抱了过来。他要抱着弟弟站到那码好的砖头上,可就是上不去。努力几次后,他放弃了——因为他明白,凭着自己的力量,是不能抱着弟弟上到砖头上去的。
    他想了想,将弟弟抱回到树阴下,把自己的双手在玻璃上贴了一
会儿,然后赶紧去握住弟弟的手。几乎在两个多小时里,哥哥就一直重复着这样的动作。
    直到快中午了,在工地上做饭的母亲来叫兄弟俩去吃饭,哥哥的这一动作才停止。妈妈问哥哥:“孩子,你为什么要这样做呢?”哥哥说:“我不能让弟弟热着,再说弟弟要是热得哭了起来,会影响爸爸妈妈工作的。”妈妈的两眼不禁红了,可哥哥似乎没有看到妈妈的表情,只顾高兴地说下去,“妈妈,我知道阴处的玻璃会是凉的,想不到城里的玻璃会这么凉。”
    妈妈本想告诉儿子:这玻璃之所以会这样凉,是因为玻璃后面的屋子里有大功率的空调。可妈妈没有说,她相信能将一手清凉传递给弟弟、心中想的是让爸爸妈妈安心工作的孩子,无论将来的日子过得如何,他都是人间最富有的。
(段奇清/文,选自《铜陵日报》,有删改)

同类题3

完形填空

     People have been raising pigeons(鸽子) for about 10,000 years. And pigeon  keepers use  different kinds of pigeons for different 1Some people use pigeons for 2 For example, in parts of China people cook a special meal with pigeon to celebrate the New Year.

Some people also keep pigeons because they look especially 3There are many interesting kinds of these “pretty” pigeons. Different kinds of pigeons have interesting features 4 long, soft tail feathers or designs on their heads. The owners of these kinds of pigeons enter them in 5  and the best looking pigeons are chosen to win prizes.

     But pigeons have many othe6   too. Pigeons can fly long distances without growing 7 . They also have another8sense. No matter how far from home they are, pigeons can usually fly back to where they9This is often called a “homing sense”. This sense makes them good for carrying10

     In many cities around the world, pigeons live in special houses, and pigeon keepers spend a lot of money and time11 their birds. When someone has a very good pigeon, he is very12    He may also have a way to make money.  But this is not usually the main13 people keep pigeons. For some people, they keep pigeons as a hobby.

     People love pigeons so much that they even take them14 when they move to a new country. They15 these birds as their children.  “When you are looking at a pigeon in the sky you feel free. It is the best feeling you have in a strange country”, a pigeon lover says.