题干

蝗虫在生长发育过程中有蜕皮现象,其原因是(  )

A:外骨骼不能随身体生 长而长大

B:有利于进行气体交换

C:蜕掉原来的外骨骼使运动更灵活

D:减轻体重,有利于运动

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答案(点此获取答案解析)

A

同类题1

根据短文理解,选择正确答案。

    I'm a 20-year-old boy,and the following is my story.

    A month after I graduated from high school in August,2007,I was coming home from swim practice in the training centre of the city and was involved in a car accident.I was so seriously injured that I was in a coma for more than two months at Prince Georges Hospital.

    I suffered a lot from the experience of dying eight times during my coma and I couldn't open my mouth to talk or to communicate when I eventually came around.At that time,it seemed that walking was never going to happen again due to all the extreme injuries.Just like my body,my dreams were completely destroyed.But I was not going to let my injuries stop me from realizing my dreams.

    After receiving a total of 15 operations and 36 blood transfusions,I had to make every great effort to learn to talk,eat,walk,shower,and live on my own again.When I was out of hospital,I still had to Go to outpatient therapy in Waldorf,Maryland.After I spent a few months in a wheelchair,I took baby steps to walk on my own.It was a miracle that I was able to walk again,but I still wanted to prove that I could not only walk,but also run.When it came true,I wanted to get back into the pool again.After having a few lung tests,I was able to go in the pool a little bit each week. After a few months of swim training,I began my freshman year at St.Mary's College of Maryland and then became a proud member of the swim team.

    By telling my story,I want to make a positive influence on the world.I am just trying to live every day to the fullest and inspire other people never to give up their dreams no matter how bad a situation is to them.I remember when I was still in my hospital bed,I would have my mom and dad push me round in my wheelchair to the other rooms to see the other patients and chat with them and their family members.I wanted to let them know that everything was going to be okay.Somehow,things would work out for the best.

同类题3

阅读下面一篇文章,完成后面小题

孟子:我们的文化宝藏

鹿义霞

    带着一颗朝拜的心,我又一次走近经典聆听孟子。书香扑面的时候,心被虔诚塞得满满。作为一代儒家宗师的孟子并没有走远,他是一座解读不尽的文化宝藏,依然穿越时空给后人启迪,给后人震撼!

    这是一个秉持忧患、心怀天下的孟子——生于乱世,勇于济世;游于列国,长途跋涉;晓之以理,苦口婆心:他奔走在游说的路上,执著而坚定,焦灼而真诚。倡导仁政,反对战争,主张以德服人,抨击暴力治国,纵然缕缕碰壁却依然不失以天下为己任的使命感。“乐以天下,忧以天下”,“人皆可以为尧舜”,“生于忧患,死于安乐”,“得道者多助,失道者寡助。寡助之至,亲戚畔之,多助之至,天下顺之”,……20多年的游说生涯,他辗转奔走,他不辞劳苦,留下了悠长的足迹,留下了经典的语句,也为我们塑造了一个激情的孟子。那份知识分子的良知,给后人留下经久的感动。

    这是一个满怀智慧、为民呼号的孟子——民生的艰辛与百姓的困苦触动着他的心灵。他重视民心的向背,深谙人民与天下的载舟覆舟关系;他向往理想社会图景,规劝统治者安定人民,善待民生。听:“诸侯之宝三:土地、人民、政事,宝珠玉者,殃必及身。”,“保民而王,莫之能御也。”,“民为贵,社稷次之,君为轻。”,“乐民之乐者,民亦乐其乐;忧民之忧者,民亦忧其忧。”……孟子的话精髓而深情。锲而不舍宣扬民本思想,持之以恒做百姓代言人,他那份深刻,他那份执著,他那份大爱,让千年后的我们读到岁月的回声。“五亩之宅,树之以桑,五十者可以衣帛矣。鸡豚狗彘之畜,无失其时,七十者可以食肉矣。百亩之田,勿夺其时,八口之家可以无饥矣。谨庠序之教,申之以孝悌之义,颁白者不负戴于道路矣。”——每当读到孟子这段话,心里就会猛然升腾起大片温暖,大片美好。

    这是一个气节超然、卓然出众的孟子——呼唤高尚人格,是《孟子》不变的主题;追求气节超然,是孟子永恒的追求;注重人格修养,是孟子真挚的宣言。“养心莫善于寡欲”,“生亦我所欲也,义亦我所欲也;二者不可得兼,舍生而取义者也”,“穷则独善其身,达则兼善天下”…… 这样的语言烙在心灵深处,指导着我们的做人,影响着我们的做事。“富贵不能淫,贫贱不能移,威武不能屈”成了很多人的精神坐标,对于中华民族的精神性格塑造,尤其对中国历代优秀知识分子的性格塑造,起到了重大的作用。想到孟子,常常想到这样四个字:浩然正气。

    这是一个才学渊博、文采飞扬的孟子——孟子的文章说理畅达、气势充沛并长于论辩。孟子的言辞形象生动、寓意深刻并耐人寻味。那些精彩的比喻,那些巧妙的构思,那些练达的语句,构成了孟子作品特别的气象。“不以规矩,不成方圆”,“五十步笑百步”,“权,然后知轻重;度,然后知长短”……孟子的作品乃中国文坛之瑰宝。

    这是一个提倡社会和谐的孟子,他说:“老吾老以及人之老,幼吾幼以及人之幼 ”;这是一个睿智理性的孟子,他说:“人有不为也,而后可以有为”;这是一个自信的孟子,他说:“尽信书,不如无书”;这是一个笑傲困难的孟子,他说:“故天降大任于斯人也,必先苦其心志,劳其筋骨,饿其体肤,空乏其身,行拂乱其所为,所以动心忍性,曾益其所不能。……

    孟子是中国儒家学派的重要代表,被尊为“亚圣”,儒家文化亦被称为“孔孟之道”。孟子在修身养性、治国安民、教育学习、交友处世、孝亲敬老等方面为我们留下了很多充满智慧和哲理的警世名言,警醒后人反刍,引发后人思考。作为思想家的孟子,作为教育家的孟子,作为政治家的孟子,作为文学家的孟子,是一座解读不尽的文化宝藏。忽然想起有本书上这样说过:阅读孟子,让经典进入民间,让传统回归现实,让历史告诉未来。