题干

如图,将两块全等的直角三角板拼接在一起.这个图形可以看作是由一块直角三角板绕着直角顶点经过一次旋转后得到的,那么旋转的角度是(     ).

A:30°

B:60°

C:90°

D:180°

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答案(点此获取答案解析)

C

同类题1

阅读下面文言文,完成下列小题。

伍子胥传

    伍子胥者,楚人也,名员。员父曰伍奢。员兄曰伍尚。其先曰伍举,以直谏事楚庄王,有显,故其后世有名于楚。

    伍尚至楚,楚并杀奢与尚也。伍胥至于吴,吴王僚方用事,公子光为将。伍胥乃因公子光以求见吴王。

    四年,吴伐楚,取六与灊①。五年,伐越,败之。六年,楚昭王使公子囊瓦将兵伐吴。吴使伍员迎击,大破楚军于豫章,取楚之居巢。后二岁,阖闾使太子夫差将兵伐楚,取番。楚惧吴复大来,乃去郢,徙于鄀。当是时,吴以伍子胥、孙武之谋,西破强楚,北威齐晋,南服越人。

    后五年,伐越。越王勾践迎击,败吴于姑苏,伤阖闾指,军却。阖闾病创将死,谓太子夫差曰:“尔忘勾践杀尔父亲?”夫差对曰:“不敢忘。”是夕,阖闾死。夫差既立为王,以伯嚭为太宰,习战射。二年后伐越,败越于夫湫。越王勾践乃以余兵五千人栖于会稽之上,使大夫种厚币遗吴太宰嚭以请和,求委国为臣妾。吴王将许之。伍子胥谏曰:“越王为人能辛苦。今天不灭,后必悔之。”吴王不听,用太宰嚭计,与越平。

    吴太宰嚭既与子胥有隙,因谗曰:“子胥为人刚暴,少恩,猜贼,其怨望恐为深祸也 。前日王欲伐齐,子胥专愎强谏,沮毁用事,徒幸吴之败以自胜其计谋耳。今王自行,悉国中武力以伐齐,而子胥谏不用,因辍谢,详病不行。王不可不备,此起祸不难。且嚭使人微伺之,其使于齐也,乃属其子于齐之鲍氏。夫为人臣,内不得意,外倚诸侯,自以为先王之谋臣,今不见用,常鞅鞅②怨望。愿王早图之。”吴王曰:“微子之言,吾亦疑之。”乃使使赐伍子胥属镂之剑,曰:“子以此死。”伍子胥仰天叹曰:“嗟呼!谗臣嚭为乱矣,王乃反诛我。我令若父霸。自若未立时,诸公子争立,我以死争之于先王,几不得立。若既得立,欲分吴国予我,我顾不敢望也。然今若听谀臣言以杀长者。”乃告其舍人曰:“必树吾墓上以梓,令可以为器;而抉吾眼县吴东门之上,以观越寇之入灭吴也。”乃自刭死。

    吴王闻之大怒,乃取子胥尸盛以鸱夷革③,浮之江中。吴人怜之,为立祠于江上,因命曰胥山。

(节选自《史记》)

【注】①灊:音qián,古地名,在今中国安徽省霍山县。②鞅鞅:通“怏怏”。因不满而郁郁不乐。③鸱夷革:皮革袋子。

同类题2

阅读理解

    I was always blamed for watching too much cartoons. As I have said goodbye to my teenage, I shift to watching more movies to prove that I was a grown-up. Surprisingly, I found that movies have something in common with cartoons. They are unrealistic.

    Sometimes movies give people hope, including the hope of justice, the hope of tomorrow and almost everything else. A great number of people were once touched by certain movies. From time to time, movies try to deliver some decisive ideas to the audience. In this way, movies do cheer up many people to go on with their lives.

    It seems that there is a set formula in movies. We usually see the hero or heroine in the movies suffer a lot in the opening. Gradually and likely, the destination of them always comes to a turning point. So they have to struggle or make some important choices. Then the movie ends up with a happy finale. Or at least the hero finally manages to face his poor life with great courage somehow. However, when audience watch movies in the cinema, most of them just follow the story. Few of them may ask, “Will it happen in the real life?”

    Movies are also imitating the real life. Thus a movie, just like a novel, can never be the same as the real life. The setting of a movie is so ideal that we could hardly find it out in reality. The moviemakers just try their best to persuade the audience to believe the story is true. In a word, it is all just make-believe.

    For quite a long time, I think that the adults' world is realistic in the opposite way of the children's cartoon. However, the movies from the adult world turn out to be a made-up thing. At the very moment, I suddenly realize that movies are somewhat of the adult's fairy tales or cartoons.

    To sum up, other than false comfort such as movies and tales, we are more in need of the maturity of mind, so that we can face our lives bravely and correctly.