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根据短文内容,从短文后的选项中选出能填入空白处的最佳选项。选项中有两项为多余选项。
Two brightly colored butterflies have just flown by. They seems to be exactly alike, but actually one is a little larger than the other.   1  The smaller one has a wingspread of less than three inches and also a black line on its back wings.
At first sight, it is hard to tell them apart. Would you guess from this that they are different-sized butterflies of the same species?  2  If you said yes to either question, you would be wrong, for these look-alikes belong to quite different families.
The larger insect is the monarch butterfly (黑脉金斑蝶). As a baby insect, the monarch feeds on milkweed, which seems to give the monarch a disagreeable taste and smell.   3  Birds that eat butterflies soon recognize the monarch and quickly learn to leave it alone.
  4  Birds would find this insect tasty, but because it looks like the monarch, birds keep away from it. The viceroy’s similarity to the monarch gives it some protection from its enemies and helps it survive.
There are other pairs of look-alike butterflies, bees and moths. In each case, one either has a disagreeable taste or smell, or can give a painful sting (叮咬). The larger is called the model.  5  
A.The smaller insect is the viceroy (副王峡蝶), which feeds on the leaves of trees.
B.The larger insect has a wingspread (翼长) of up to four inches.
C.The bright coloring of the monarch acts as a warning sign to its enemy.
D.Birds protect their babies from eating such dangerous enemies.
E. The insect that imitates this model for protection is called the mimic(保护色).
F. Or that they are different species of butterflies but close relatives belonging to the same family?
G. Do you like this kind of special species?

小题1:B
小题2:F
小题3:C
小题4:A
小题5:E

试题分析:本文介绍了各种蝴蝶为了保护自己所拥有的不同的保护色。
小题1:B 根据下一句The smaller one has a wingspread of less than…讲述的小一点的蝴蝶的情况,说明本句讲述的应该是大一点的蝴蝶的情况,故B符合上下文。
小题2:F 根据上一句Would you guess from this that they are different-sized butterflies of the same species?他们是同一种类的不同尺寸,还是不同种类的近亲关系。故F项符合上下文结构。
小题3:C 根据下一句Birds that eat butterflies soon recognize the monarch and quickly learn to leave it alone.说明这种明亮的颜色是对敌人的一种警告,故C项正确。
小题4:A 根据上一段The larger insect is the monarch butterfly说明本段应该讲述的是smaller butterfly,故A正确。
小题5:E 这句话是一个归纳总结的话,所有的蝴蝶的颜色都属于保护自己的保护色。故E项符合上下文。
点评:此类文章重在把握上下文之间的逻辑关系,通过前后的意思连贯性及细致性用心的答题,定能完成的很好。
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