题目
Dragonflies （蜻蜓） eat a lot， and they constantly hunt for food． What's more， they usually catch it in the air． Zig! The dragonfly catches a small fly． Zag! It seizes a mosquito． Very few insects can outfly the dragonfly． No matter how fast they go， no matter which way they turn， the dragonfly is usually able to follow． Two engineers at the University of Tennessee Space Institute have been studying the way that dragonflies fly． Dr． James Wu and Dr． Ahmad Vakili are studying ways to design a fighter plane that can change direction as quickly and easily as dragonflies can． Why is that important？ If you are in a fighter plane， and another plane is after you， you want to be able to fly more quickly than the other plane， Dr． Vakili says． A dragonfly's wings are the key to its flying ability， Dr． Wu and Dr． Vakili say． If you look closely， you will see that a dragonfly has two wings on each side of its body-a long front wing and a slightly shorter back wing． During flight， small but powerful winds of air move along each of the dragonfly's front wings． Thus， the pressure of air keeps the dragonfly up in the air． A dragonfly's back wings help keep the winds from breaking up． Dr． Wu and Dr． vakili are studying ways to make fighter plane wings use air flow as efficiently as dragonfly wings． Does this mean that someday we'll have fighter planes that look like dragonflies？ Dr． Wu and Dr． vakili say no， because that would not be practical． They don't want wings that look like a dragonfly's． Rather， they want wings that work like a dragonfly's-designed to help fighter planes change course quickly and outfly their enemies．（1）The opening paragraph is mainly intended to show ____ ．A． the flying abilities of dragonfliesB． how dragonflies search for foodC． the food dragonflies preferD． why dragonflies fly so fast（2）What helps dragonflies fly quickly and change direction easily？ ____ A． The shape of their wings．B． The number of their wings．C． The strength of their wings．D． The structure of their wings．（3）Dr． Wu and Dr． vakili want to make fighter planes that can take advantage of ____ ．A． the power of the windB． the direction of the windC． air flowD． air pressure（4）We can infer that the fighter planes designed by Dr． Wu and Dr． vakili may ____ ．A． fly at a greater heightB． look like dragonfliesC． have more functionsD． make a turn quickly
Dragonflies （蜻蜓） eat a lot， and they constantly hunt for food． What's more， they usually catch it in the air． Zig! The dragonfly catches a small fly． Zag! It seizes a mosquito． Very few insects can outfly the dragonfly． No matter how fast they go， no matter which way they turn， the dragonfly is usually able to follow．
Two engineers at the University of Tennessee Space Institute have been studying the way that dragonflies fly． Dr． James Wu and Dr． Ahmad Vakili are studying ways to design a fighter plane that can change direction as quickly and easily as dragonflies can． Why is that important？ If you are in a fighter plane， and another plane is after you， you want to be able to fly more quickly than the other plane， Dr． Vakili says．
A dragonfly's wings are the key to its flying ability， Dr． Wu and Dr． Vakili say． If you look closely， you will see that a dragonfly has two wings on each side of its body-a long front wing and a slightly shorter back wing． During flight， small but powerful winds of air move along each of the dragonfly's front wings． Thus， the pressure of air keeps the dragonfly up in the air． A dragonfly's back wings help keep the winds from breaking up．
Dr． Wu and Dr． vakili are studying ways to make fighter plane wings use air flow as efficiently as dragonfly wings． Does this mean that someday we'll have fighter planes that look like dragonflies？ Dr． Wu and Dr． vakili say no， because that would not be practical． They don't want wings that look like a dragonfly's． Rather， they want wings that work like a dragonfly's-designed to help fighter planes change course quickly and outfly their enemies．
（1）The opening paragraph is mainly intended to show ____ ．
A． the flying abilities of dragonflies
B． how dragonflies search for food
C． the food dragonflies prefer
D． why dragonflies fly so fast
（2）What helps dragonflies fly quickly and change direction easily？ ____
A． The shape of their wings．
B． The number of their wings．
C． The strength of their wings．
D． The structure of their wings．
（3）Dr． Wu and Dr． vakili want to make fighter planes that can take advantage of ____ ．
A． the power of the wind
B． the direction of the wind
C． air flow
D． air pressure
（4）We can infer that the fighter planes designed by Dr． Wu and Dr． vakili may ____ ．
A． fly at a greater height
B． look like dragonflies
C． have more functions
D． make a turn quickly
Two engineers at the University of Tennessee Space Institute have been studying the way that dragonflies fly． Dr． James Wu and Dr． Ahmad Vakili are studying ways to design a fighter plane that can change direction as quickly and easily as dragonflies can． Why is that important？ If you are in a fighter plane， and another plane is after you， you want to be able to fly more quickly than the other plane， Dr． Vakili says．
A dragonfly's wings are the key to its flying ability， Dr． Wu and Dr． Vakili say． If you look closely， you will see that a dragonfly has two wings on each side of its body-a long front wing and a slightly shorter back wing． During flight， small but powerful winds of air move along each of the dragonfly's front wings． Thus， the pressure of air keeps the dragonfly up in the air． A dragonfly's back wings help keep the winds from breaking up．
Dr． Wu and Dr． vakili are studying ways to make fighter plane wings use air flow as efficiently as dragonfly wings． Does this mean that someday we'll have fighter planes that look like dragonflies？ Dr． Wu and Dr． vakili say no， because that would not be practical． They don't want wings that look like a dragonfly's． Rather， they want wings that work like a dragonfly's-designed to help fighter planes change course quickly and outfly their enemies．
（1）The opening paragraph is mainly intended to show ____ ．
A． the flying abilities of dragonflies
B． how dragonflies search for food
C． the food dragonflies prefer
D． why dragonflies fly so fast
（2）What helps dragonflies fly quickly and change direction easily？ ____
A． The shape of their wings．
B． The number of their wings．
C． The strength of their wings．
D． The structure of their wings．
（3）Dr． Wu and Dr． vakili want to make fighter planes that can take advantage of ____ ．
A． the power of the wind
B． the direction of the wind
C． air flow
D． air pressure
（4）We can infer that the fighter planes designed by Dr． Wu and Dr． vakili may ____ ．
A． fly at a greater height
B． look like dragonflies
C． have more functions
D． make a turn quickly
题目解答
答案
1．A．细节理解题．根据文章第一段Very few insects can outfly the dragonfly． No matter how fast they go， no matter which way they turn， the dragonfly is usually able to follow．不管它们飞得多快，无论它们转向哪个方向，蜻蜓通常都能跟上．可知开头一段主要是为了展示蜻蜓的飞行能力；故选A．
2．D．细节理解题．根据文章第三段 If you look closely， you will see that a dragonfly has two wings on each side of its body-a long front wing and a slightly shorter back wing．如果你仔细观察，你会发现蜻蜓的身体两侧各有两只翅膀-长的前翼和略短的后翼．可知翅膀的结构能帮助蜻蜓快速飞行并轻易改变方向；故选D．
3．C．细节理解题．根据文章第四段 Dr． Wu and Dr． vakili are studying ways to make fighter plane wings use air flow as efficiently as dragonfly wings．吴博士和瓦基利博士正在研究如何使战斗机机翼像蜻蜓翅膀一样有效地利用气流．可知吴博士和Vakili博士想制造出能利用气流的力量的战斗机；故选C．
4．D．细节理解题．根据文章第四段 Rather， they want wings that work like a dragonfly's-designed to help fighter planes change course quickly and outfly their enemies．相反，他们想要像蜻蜓那样工作的翅膀-旨在帮助战斗机快速改变航向，飞出敌人的翅膀可知我们可以推断出由吴博士和Vakili博士设计的战斗机可能很快转弯；故选D
2．D．细节理解题．根据文章第三段 If you look closely， you will see that a dragonfly has two wings on each side of its body-a long front wing and a slightly shorter back wing．如果你仔细观察，你会发现蜻蜓的身体两侧各有两只翅膀-长的前翼和略短的后翼．可知翅膀的结构能帮助蜻蜓快速飞行并轻易改变方向；故选D．
3．C．细节理解题．根据文章第四段 Dr． Wu and Dr． vakili are studying ways to make fighter plane wings use air flow as efficiently as dragonfly wings．吴博士和瓦基利博士正在研究如何使战斗机机翼像蜻蜓翅膀一样有效地利用气流．可知吴博士和Vakili博士想制造出能利用气流的力量的战斗机；故选C．
4．D．细节理解题．根据文章第四段 Rather， they want wings that work like a dragonfly's-designed to help fighter planes change course quickly and outfly their enemies．相反，他们想要像蜻蜓那样工作的翅膀-旨在帮助战斗机快速改变航向，飞出敌人的翅膀可知我们可以推断出由吴博士和Vakili博士设计的战斗机可能很快转弯；故选D
解析
步骤 1：理解第一段的意图
第一段描述了蜻蜓的飞行能力和捕食方式，强调了蜻蜓的飞行速度和灵活性。因此，第一段的主要意图是展示蜻蜓的飞行能力。
步骤 2：分析蜻蜓飞行快速和改变方向容易的原因
蜻蜓的飞行快速和改变方向容易的原因在于其翅膀的结构。蜻蜓的翅膀分为前翼和后翼，前翼和后翼的结构和功能共同作用，使得蜻蜓能够快速飞行和改变方向。
步骤 3：理解吴博士和瓦基利博士的研究目的
吴博士和瓦基利博士研究蜻蜓的飞行方式，目的是设计一种能够像蜻蜓一样快速改变方向的战斗机。他们希望战斗机的翅膀能够像蜻蜓的翅膀一样有效地利用气流。
步骤 4：推断吴博士和瓦基利博士设计的战斗机的特点
吴博士和瓦基利博士设计的战斗机不会像蜻蜓一样，因为这在实际应用中是不切实际的。他们希望战斗机的翅膀能够像蜻蜓的翅膀一样工作，帮助战斗机快速改变航向，飞出敌人的翅膀。
第一段描述了蜻蜓的飞行能力和捕食方式，强调了蜻蜓的飞行速度和灵活性。因此，第一段的主要意图是展示蜻蜓的飞行能力。
步骤 2：分析蜻蜓飞行快速和改变方向容易的原因
蜻蜓的飞行快速和改变方向容易的原因在于其翅膀的结构。蜻蜓的翅膀分为前翼和后翼，前翼和后翼的结构和功能共同作用，使得蜻蜓能够快速飞行和改变方向。
步骤 3：理解吴博士和瓦基利博士的研究目的
吴博士和瓦基利博士研究蜻蜓的飞行方式，目的是设计一种能够像蜻蜓一样快速改变方向的战斗机。他们希望战斗机的翅膀能够像蜻蜓的翅膀一样有效地利用气流。
步骤 4：推断吴博士和瓦基利博士设计的战斗机的特点
吴博士和瓦基利博士设计的战斗机不会像蜻蜓一样，因为这在实际应用中是不切实际的。他们希望战斗机的翅膀能够像蜻蜓的翅膀一样工作，帮助战斗机快速改变航向，飞出敌人的翅膀。