题干

若线段AB=2,且点C是AB的黄金分割点,则BC等于(  )

A:5-1

B:3-5

C:5-12

D:5-1或3-5

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答案(点此获取答案解析)

D

同类题3

根据短文内容, 从短文后的选项中选出能填入空白处的最佳选项。选项中有两项为多余选项。

    There are a lot of people who are overweight all over the world. What causes obesity? If you get the gene(基因), well, probably you are going to be a few more pounds heavier compared to the rest of your classmates or friends. ____ Obesity can not only make a person look heavy, and not in the usual sense of being handsome, but can also lead to serious health conditions and life-threatening diseases.

    ____ Indeed, junk food has been blamed for the prevalence(流行)of obesity. It is called junk food, because hamburger, pizza and the like contain high calories. If you eat a Big Mac (a super hamburger), an order of large fries, and a large Coke, you will need to walk non-stop for six hours to burn off the calories you have gained. And don't be fooled by soft drinks, which are high in sugar and are a major cause of obesity.

    ____ Popular sugary drinks, of course, include Coca Cola, Pepsi(百事) Cola, and many new brands that appear on the market every couple of days.

    ____ Just one 20-ounce (about 567g) bottle of soda can have 250 calories, which are equal to more than 16 teaspoons of added sugars. Even a lemon-flavored iced tea can have 210 calories.

    ____ Next time, when you are ready to eat that huge Mac and to drink that two-liter bottle of Pepsi, probably it's a good idea to give it a second thought.

A. Obesity is more common in women than men.

B. Most people don't realize how easy it is to gain weight from drink sugar-sweetened beverages(饮料)

C. When we talk about obesity, the first thought that comes to mind is: junk food.

D. The unburnt calories will put weight on you.

E. Keeping healthy is our own responsibility.

F. Because of their high content of sugar, soft drinks are also called sugary drinks.

G. However, the most common cause of obesity is eating too much, especially too much junk food.

同类题5

阅读下文,完成后面小题。

寂寞的月亮

       在我的视野里,月亮是寂寞的。她那么孤单地悬挂在天空,星星离她那么遥远,地球离她那么遥远,就连一直在给她光和热的太阳,也总是离她那么遥远。月亮孤孤单单地悬挂在天上,已经有数亿万年了吧?这是何等漫长的寂寞呵!

       看那些从月球上发回来的照片,月亮上面,永远都是冰天雪地的样子,永远都是戈壁荒原的样子。月亮上面,有山峰,但那些山峰是寂寞的;有峡谷,可那些峡谷是寂寞的;她的那些平原,广袤地铺展开去的,不是江南水乡那样的美,而是无尽的荒凉。月亮上没有风,她连听一听轻风吟哦的机会都没有;月亮上没有雨,她连看一看雨丝飘飞的可能都没有。她没树,没有水,没有空气,甚至连一丁点的小小生命也没有。月亮,不只是寂寞,而是死一般的寂寞了。

       关于月亮,从古到今,有很多传说,什么“嫦娥奔月”,什么“吴刚伐桂”,但是月亮压根儿就没有过这些。那些传说,不过是人类的种种附会罢了。月亮什么也没有。也许,她正是为了排解寂寞,才不停地围绕着地球旋转的吧?如果是这样,那她的寂寞就更加让人心疼了。可是,我们心疼过或关心过月亮的寂寞吗?没有。我们似乎从来就没想到过她的寂寞与孤独。我们看不到她的时候,总是在心头埋怨着她,甚至是不停地指责着她。很多年了,月亮总是这样被我们埋怨和指责着。我们只知味地从她那里享受月光、获得诗意、索取浪漫来满足自己的需要。为了月亮,我们写过很多诗文,但篇篇翻开来看,那不是写给月亮的,不是的,那是我们借助月亮来写给我们自己的。我们还借助月亮唱过许多歌,然而,那一首首歌,没一首是专门唱给月亮的。是的,我们不仅没有为月亮付出过什么,而且,还无止境地向月亮索取。我们的这些行为,是多么的自私!

       可是,我们是否想过,月亮其实是不屑于自己的寂寞的。

       数亿万年了,月亮从来没有埋怨过广寒宫的寂寞,也从来没有向谁诉说过心中的孤独。她似乎知道寂寞的苦痛,所以,一如既往地用她的光为我们照亮黑夜,为我们排解寂寞。不是吗?是月亮让李白在孤独中找到了自己的知音,他大胆地“举杯邀明月,对影成三人”,狂放地“我歌月徘徊,我舞影零乱”,月亮在李白的心中成了可以永远结游的朋友。月亮也似乎懂得那些游子的心,所以她总是用她的圆祈盼人间团圆和美满。她总是希望每一个游子能够平平安安回家,总是祝福所有的有情人能够成为一生一世相亲相爱的眷属,总是盼望每一个家庭能够和和睦睦美美好好。除此之外,她还为我们带来许多浪漫的诗意,装点我们的家园和生活,让我们一代一代在这诗意的家园中生生息息。据说,在月明之夜,那些小偷和其他不良分子,其犯罪的概率都小了许多。由此看来,明洁而光辉的月亮是在劝化人们从善,是在把友爱、道德和人性洒向人间。是的,这就是月亮,她在广寒宫忍受着永恒的寂寞,却总是把美好与祝福呈献给我们。

       月亮是很大度的,很高尚的。她从不计较和埋怨,始终洁白、纯净、无瑕地高悬在天空中,给予我们无声的启示与祝愿。也许,这样的月亮才叫做月亮,而不是随便叫做一颗什么星星。也许正是因为这样,她才值得我们前赴后继地去仰望、去等待、去盼望,甚至去呼唤……

       然而,月亮又似乎根本就不在意这些,她独自悬挂于天空,不因为众星捧月而圆,不因为众人遥望而亮。她就是她,寂寞地悬挂于天空,孤独地洁白于天空。她不会因为什么而改变,更不会因为什么而消失。

       在数亿万年的寂寞中,她银色的圆,是太阳神奖励给她的一枚勋章!