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(復(fù)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(紫外線),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(觸角),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(振動).
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 本文是一篇說明文,主要寫了美麗的生物--蝴蝶的特殊的生理結(jié)構(gòu).蝴蝶的生理結(jié)構(gòu)十分難理解,僅僅通過人的感知能力來了解還遠(yuǎn)遠(yuǎn)不夠.
解答 28.C.細(xì)節(jié)理解題.根據(jù)倒數(shù)第二段don't have ears.Instead they"hear"sounds through their wings by sensing changes in sound vibrations (振動).蝴蝶沒有耳朵,取代她們的耳朵,聲音是根據(jù)震動的變化通過它們的翅膀傳達(dá)的.故選C.
29.B.細(xì)節(jié)理解題.根據(jù)倒數(shù)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關(guān)注找到好的寄宿植物,通過品嘗來找到適合的地方產(chǎn)卵.故選B.
30.B.主旨大意題.通讀全文,可知文章主要寫了蝴蝶的生理結(jié)構(gòu)十分難理解,僅僅通過人的感知能力來了解還遠(yuǎn)遠(yuǎn)不夠;故選B.
點評 考察學(xué)生的細(xì)節(jié)理解和推理判斷能力,做細(xì)節(jié)理解題時一定要找到文章中的原句,和題干進(jìn)行比較,再做出正確的選擇.在做推理判斷題不要以個人的主觀想象代替文章的事實,要根據(jù)文章事實進(jìn)行合乎邏輯的推理判斷.