题目内容
15.Butterflies are some of the most fascinating and beautiful insects in the world.Adult butterflies will live about 2to 4weeks.They use their senses of sight,touch,hearing,smell,and taste to survive in the world,find food and mates,lay eggs in an appropriate place,migrate,and avoid hungry enemies.Butterflies have large compound eyes(复眼),which allow them to see in all directions without turning their heads.Like most insects,butterflies are very nearsighted,so they are more attracted to a sea of flowers than individual plants.
Butterflies do not"see"colors such as red,green,and yellow,but they can sense sunlight,which indicates the direction the sun is shining,as well as ultraviolet light(紫外线),which is present on many flowers and guides butterflies to honey sources.
Butterflies have a very well-developed sense of smell,but it is not in their nose,since they don't have one.Sense receptors are located in their antennae(触角),feet,and many other parts of the body.They can help butterflies find their favorite flower honey food,and mates.
Butterflies'feet have sense organs that can taste the sugar in flower honey,letting the butterflies know if something is good to eat or not.Some females also carefully choose host plants by tasting to find appropriate places to lay their eggs.Adult butterflies feed their babies using a long tube.Butterflies force blood into the tube to straighten it out,allowing them to feed.Butterflies get all their food from this tube.
Butterflies don't have ears.Instead they"hear"sounds through their wings by sensing changes in sound vibrations(振动).
Butterflies may possess senses we don't even know about yet,because their body structure is very different from ours,and therefore difficult to understand,when observed through our own human senses.
28.How do butterflies hear sounds?C
A.Using their feet to sense the vibration of things
B.Using their ears to listen directly
C.Using their wings to sense the sound vibrations
D.Using their antennae to judge the sound
29.Why do female adult butterflies carefully choose the host plants?B
A.To find high-qualified honey.
B.To find a proper place for their eggs.
C.To make it easier for them to hide from the enemies.
D.To have a good place for living.
30.The text mainly focuses onB.
A.butterflies'living habits
B.butterflies'senses
C.butterflies'daily activities
D.butterflies'beauty.
分析 本文是一篇说明文,主要写了美丽的生物--蝴蝶的特殊的生理结构.蝴蝶的生理结构十分难理解,仅仅通过人的感知能力来了解还远远不够.
解答 28.C.细节理解题.根据倒数第二段don't have ears.Instead they"hear"sounds through their wings by sensing changes in sound vibrations (振动).蝴蝶没有耳朵,取代她们的耳朵,声音是根据震动的变化通过它们的翅膀传达的.故选C.
29.B.细节理解题.根据倒数第三段females also carefully choose host plants by tasting to find proper places to lay their eggs.一些雌性蝴蝶也非常关注找到好的寄宿植物,通过品尝来找到适合的地方产卵.故选B.
30.B.主旨大意题.通读全文,可知文章主要写了蝴蝶的生理结构十分难理解,仅仅通过人的感知能力来了解还远远不够;故选B.
点评 考察学生的细节理解和推理判断能力,做细节理解题时一定要找到文章中的原句,和题干进行比较,再做出正确的选择.在做推理判断题不要以个人的主观想象代替文章的事实,要根据文章事实进行合乎逻辑的推理判断.
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