Question

20．There are about 15，000-20，000 species of butterflies all over the world．They can be found on every continent except Antarctica．
To go to sleep，butterflies look for a safe place like the underside of a leaf or a branch，for example．Most butterflies sleep alone，but there are also species sleeping in groups．Poisonous butterflies have a particular smell that probably protects them better when they sleep together．It is also useful not to change the group'S sleeping place because a predator（食肉動(dòng)物）who attacked a poisonous butterfly one time won't do this again．There is only a limited number of predators in an area so there is only a limited number to"educate"if the sleeping place stays the same．
One species from Costa Rica whose scientific name is Marpesia berania sleeps in groups on a leaf．If one butterfly of the group is disturbed，it opens its wings and touches its neighbors．Being touched，they open their wings as well and so the whole group is informed about the danger and Can escape together．
The speed of their flight depends on the way the butterfly flies：Blues and Whites normally have speeds under 8 km/h，the speed of Fritillaries is between 16 to 40 km/h and some Skippers reach speeds up to 60 km/h．
Besides warning and scaring predators with colors butterflies fly in a special way．The direction of their amazing flight is hard to predict．When they hear the sounds of a bat，the ones flying at night start a zigzag（之字形）flight in all directions：up and down，left and right．So it gets hard for the bat to catch them．
In the dark when colors don't function，some poisonous butterflies make clicking noises to warn bats that they are poisonous．Of course other species copy this sound to produce the protective effect，too．
56．The reason why butterflies don't change the group'S sleeping place is thatB
A．a(chǎn) predator would attack them again in the same place
B．few other predators would attack them in this fixed area
C．the predators would know they are poisonous
D．there are more predators in other places
57．The author takes Marpesia berania for example in order toC．
A．introduce where butterflies sleep at night
B．tell us how butterflies work together to defeat predators
C．introduce how butterflies sleeping in groups escape from danger
D．tell us that Marpesia berania is the most clever butterflies
58．What does Paragraph 4 mainly tell us？D
A．The different flight speeds of the butterfly．
B．Which butterfly flies at the highest speed．
C．Most butterflies fly at a low speed．
D．The different way the butterfly flies．
59．It'S hard for bats to catch butterflies because butterflies flyD．
A．much faster than bats   
B．a(chǎn)imlessly
C．a(chǎn)t different speeds
D．in a zigzag way
60．Some poisonous butterflies warn predators in the dark byC．
A．scaring predators with colors
B．touching their neighbors with their wings
C．making clicking noises
D．copying bats'sound to confuse predators．

Answer 1

分析 本文主要講述了蝴蝶睡覺(jué)的特點(diǎn)特征．

解答 BCDDC
56  B   細(xì)節(jié)題． 根據(jù)文章第二 段It is also useful not to change the group'S sleeping place because a predator（食肉動(dòng)物）who attacked a poisonous butterfly one time won't do this again． 可知蝴蝶不改變?nèi)航M睡覺(jué)地方的原因是被有毒蝴蝶襲擊的食肉動(dòng)物不會(huì)再來(lái)吃蝴蝶的，故選B．
57  C  細(xì)節(jié)題． 根據(jù)文章第三 段Being touched，they open their wings as well and so the whole group is informed about the danger and Can escape together． 可知舉例的目的是告訴讀者群居蝴蝶是如何躲避危險(xiǎn)的，故選C．
58  D細(xì)節(jié)題． 根據(jù)文章第四段 Besides warning and scaring predators with colors butterflies fly in a special way．可知第四段的段落大意是蝴蝶飛行的不同方式，故選D．
59  D  細(xì)節(jié)題． 根據(jù)文章第四 段 When they hear the sounds of a bat，the ones flying at night start a zigzag（之字形）flight in all directions：up and down，left and right．So it gets hard for the bat to catch them．可知蝴蝶飛之字形的目的是為了躲避敵人，故選D．
60  C  細(xì)節(jié)題． 根據(jù)文章最后一段In the dark when colors don't function，some poisonous butterflies make clicking noises to warn bats that they are poisonous 可知有毒蝴蝶通過(guò)制造點(diǎn)擊噪音警告蝙蝠，故選C．

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