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> 阅读下文,完成1-3题。苍蝇·蜻蜓·萤火虫的启迪①六足四翅的昆虫家族,在地球上已经繁衍了三亿五千万年。昆虫世界是一个神秘的世界,对昆虫奥秘的探索,推动了科学技术的发展。-九年级语文
阅读下文,完成1-3题。苍蝇·蜻蜓·萤火虫的启迪①六足四翅的昆虫家族,在地球上已经繁衍了三亿五千万年。昆虫世界是一个神秘的世界,对昆虫奥秘的探索,推动了科学技术的发展。-九年级语文
题目简介
阅读下文,完成1-3题。苍蝇·蜻蜓·萤火虫的启迪①六足四翅的昆虫家族,在地球上已经繁衍了三亿五千万年。昆虫世界是一个神秘的世界,对昆虫奥秘的探索,推动了科学技术的发展。-九年级语文
题目详情
阅读下文,完成1-3题。
苍蝇·蜻蜓·萤火虫的启迪
①六足四翅的昆虫家族,在地球上已经繁衍了三亿五千万年。昆虫世界是一个神秘的世界,对昆虫奥秘的探索,推动了科学技术的发展。
②昆虫的复眼,构造精巧,由几十、几百乃至二三万只小眼紧密排列组成。人眼要用0.05秒才能看清物体的轮廓,复眼只要0.01秒钟就可以了。因为复眼有很好的运动知觉,能够看清楚快速运动的物体,是一个很好的速度计。科学家根据
这一原理
,研制出测量飞机相对地面飞行速度的“飞机对地速度计”。
③苍蝇的一只复眼约有三千只小眼,是一种蜂窝型结构。人们仿照它研制出一种新型照相机“蝇眼”,一次能拍摄1329张照片,分辨率每厘米达4000线。
④昆虫是首先获得飞翔能力的生物,大约在三亿年前就升入高空,比爬行类、鸟类要早五千万年。蜻蜓翅膀的提升力,按体重比例计算,比目前最好的飞机还大三倍。科学家采用塑料制成“昆虫飞机”,安上发动机就能飞上天。这种用无线电操纵的“昆虫飞机”可以用于航空摄影、探测气象、山区运输等。
⑤苍蝇一类双翅目昆虫,后翅的痕迹器官——楫翅,飞行时每秒钟振动330次,是天然的导航器官。科学家依据楫翅的导航原理,制成“振动陀螺仪”,其体积是传统陀螺仪的五分之一。还研制成“振弦角速率陀螺”等新型导航仪器,用于高度飞行的火箭、飞机,自动平衡各种程度的倾斜,稳定飞行。
⑥小小萤火虫把化学能转变成光能的效率几乎达到百分之百,而普通的电灯的效率只有6%左右。荧光发出的热,只有一摄氏度的四十万分之一,这是自然界的一个伟大奇迹。随着对萤火虫发光的深入研究,制成了应用于矿井的闪光灯和水下照明灯,以后还将用来探知外星是否有生物的存在,以及癌症的早期诊断。(选自《时文精选》(第五辑)作者:杨书培)
1、选文要说明的主要内容是什么?请从原文中找一句话回答。
____________________________________________________
2、第②自然段中加粗的“这一原理”指代什么?
____________________________________________________
3、选文主要运用了 ________________ 、________________的说明方法。
题型:阅读理解与欣赏
难度:中档
来源:湖南省中考真题
答案
1.昆虫世界是一个神秘的世界,对昆虫奥秘的探索,推动了科学技术的发展。
2.复眼有很好的运动知觉,能够看清楚快速运动的物体,是一个很好的速度计。
3.列数字 作比较
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题目简介
阅读下文,完成1-3题。苍蝇·蜻蜓·萤火虫的启迪①六足四翅的昆虫家族,在地球上已经繁衍了三亿五千万年。昆虫世界是一个神秘的世界,对昆虫奥秘的探索,推动了科学技术的发展。-九年级语文
题目详情
②昆虫的复眼,构造精巧,由几十、几百乃至二三万只小眼紧密排列组成。人眼要用0.05秒才能看清物体的轮廓,复眼只要0.01秒钟就可以了。因为复眼有很好的运动知觉,能够看清楚快速运动的物体,是一个很好的速度计。科学家根据这一原理,研制出测量飞机相对地面飞行速度的“飞机对地速度计”。
③苍蝇的一只复眼约有三千只小眼,是一种蜂窝型结构。人们仿照它研制出一种新型照相机“蝇眼”,一次能拍摄1329张照片,分辨率每厘米达4000线。
④昆虫是首先获得飞翔能力的生物,大约在三亿年前就升入高空,比爬行类、鸟类要早五千万年。蜻蜓翅膀的提升力,按体重比例计算,比目前最好的飞机还大三倍。科学家采用塑料制成“昆虫飞机”,安上发动机就能飞上天。这种用无线电操纵的“昆虫飞机”可以用于航空摄影、探测气象、山区运输等。
⑤苍蝇一类双翅目昆虫,后翅的痕迹器官——楫翅,飞行时每秒钟振动330次,是天然的导航器官。科学家依据楫翅的导航原理,制成“振动陀螺仪”,其体积是传统陀螺仪的五分之一。还研制成“振弦角速率陀螺”等新型导航仪器,用于高度飞行的火箭、飞机,自动平衡各种程度的倾斜,稳定飞行。
⑥小小萤火虫把化学能转变成光能的效率几乎达到百分之百,而普通的电灯的效率只有6%左右。荧光发出的热,只有一摄氏度的四十万分之一,这是自然界的一个伟大奇迹。随着对萤火虫发光的深入研究,制成了应用于矿井的闪光灯和水下照明灯,以后还将用来探知外星是否有生物的存在,以及癌症的早期诊断。(选自《时文精选》(第五辑)作者:杨书培)
1、选文要说明的主要内容是什么?请从原文中找一句话回答。
____________________________________________________
2、第②自然段中加粗的“这一原理”指代什么?
____________________________________________________
3、选文主要运用了 ________________ 、________________的说明方法。
答案
2.复眼有很好的运动知觉,能够看清楚快速运动的物体,是一个很好的速度计。
3.列数字 作比较