题干

下列图形都是由同样大小的五角星按一定的规律组成,其中第①个图形一共有2个五角星,第②个图形一共有8个五角星,第③个图形一共有18个五角星,…,则第⑥个图形中五角星的个数为(   )

A:50

B:64

C:68

D:72

上一题 下一题 0.0难度 选择题 更新时间:2018-03-02 12:43:24

答案(点此获取答案解析)

D

同类题2

阅读下列短文,从每题所给的四个选项(A、B、C和D)中,选出最佳选项

    A blocked airway(呼吸道) can kill someone in three to four minutes, but it can take more than eight minutes for an ambulance to arrive. So a simple procedure such as opening someone's airway can save their life while they're waiting for emergency medical help. This means you're more likely to give first aid to someone you know than a stranger.

    There are many misconceptions (误解) surrounding first aid. Below are the ‘most popular' ones with details of what you should do.

    You should put butter or cream on a burn. The only thing you should put on a burn is cold water — keep the butter for cooking. Put the affected area under cold running water for at least ten minutes.

    The best way to treat bleeding is to put the wound under a tap. If you put a bleeding wound under a tap you wash away the body's clotting agents(凝血剂) and make it bleed more. Instead put pressure on the wound with whatever is available to stop or slow down the flow of blood. As soon as possible call 999. Keep pressure on the wound until help arrives.

    Nosebleeds are best treated by putting the head back. If you put the head back during a nosebleed, all the blood goes down the back of the airway. Instead advise them to tilt(倾斜) their head forwards and ask the person to pinch(捏) the end of their nose and breathe through their mouth.

    You need lots of training to do first aid. You don't — what you mostly need is common sense. You can learn enough first aid in a few minutes to save someone's life — whether it's from a book, attending a course or watching videos online.

    Remember: anyone can save a life

同类题3

阅读下面的文字,完成下列小题。

春天

    ①热爱生活的人,对待春天就像珍惜自己的生命般真挚而执著。一丝毫不起眼的绿,一抹微不足道的青,会使他眸子闪亮,盈满青春的光彩;心湖生辉,荡漾幸福的涟漪。春天对于热爱它的人,无时无刻不在散发着一股神奇的魔力和生命力。

    ②春在田畴,松软的泥土散发着清新温润的气息,冬憩后醒来的麦苗儿精神焕发,展现出一派蓬勃盎然的生机;渠水欢唱,如母爱的乳汁,与土地和麦苗的血液水乳交融。春在河畔,鱼虾畅游,蛙鼓抑扬弄喉嗓,柳丝婆娑舞倩影,阳光水波交相辉映,洒落捧捧金和银。春在天空,燕语呢喃,蝴蝶翩跹,风筝高飞,春意弥漫在洁白的云朵间,甜脆笑声穿梭于浩渺的九天。春在果园,红杏流火,桃花漫霞,梨树飞雪,蜂蝶追逐喧嚷,酝酿生活的甘甜和芬芳……

    ③春天是一缕轻轻吟唱的和风,一捧温暖明亮的阳光;春天是声声婉转清脆的鸟语,片片馥郁醉人的花香;春天是青青草尖上的一颗露珠,红红花朵上的一抹彩霞;春天是种子破土而出时拱动的力,树木拔节时喧响的节奏;春天是透明纯净的梦,火热沸腾的歌,灵歌流溢的诗;春天是孩子脸蛋土的天真无邪,姑娘面颊上的秀美羞怯;春天是我们用汗水、勤劳和智慧栽种的一茬茬的希望、梦幻和理想。

    ④热爱春天,播种春天,采撷春天吧!用我们的言传身教去呵护春天、关心春天。用我们的心血去精心编织春天、灌溉春天。呵护关心春天的风吟鸟啼柳绿花红,编织灌溉春天的田园风光妖娆风情,让春天常驻我们身边,永驻我们心灵深处的爱心家园……