Butterfliesare common all over the world but the ones in hot countries are usual

Butterflies（蝴蝶）are common all over the world but the ones in hot countries are usually bigger and more brightly colored than those in cooler countries, and there are more different kinds.

Usually the male（雄性）butterfly is more brightly colored than the female （雌性）. The females have bigger and heavier bodies, since they carry the eggs. The gay colors of the male help to attract the female and the duller（暗淡的）colors of the female make them less likely to be caught by enemies before they have laid their eggs.

Some butterflies have a bright pattern of colors on the upper Surface of their wings which show when they fly, but when they rest on a tree or leaf, they close their wings. On the undersides of their wings there are green and brown markings which look like the trees or leaves. They are then difficult to be seen. The best example of this is the Dead leaf Butterfly. When its wings are closed, it looks exactly like a dead leaf. There are even marks that look like the holes in a dead leaf. When a bird is chasing（追逐）a butterfly, and the butterfly closes its wings, it cannot be seen. When a bird sees one, and begins to attack it, the butterfly opens its wings. The bird thinks that it sees two eyes staring at it, and, frightened, it flies away.

(1) Which of the following is likely to be the most brightly colored ?

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A．A male in a hot country.

B．A male in a cool country.

C．A Dead Leaf Butterfly with its wings closed.

D．A large, heavy butterfly.

(2) What is the purpose of the gay colors of a male butterfly?

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A．To frighten birds away.

B．To help to get the attention of the female.

C．To make it more difficult to be seen.

D．To protect itself from the female.

(3) Female butterflies are safe from enemies because they _____.

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A．often lay eggs in hiding places

B．cannot be seen with their wings closed

C．are bigger and heavier than male butterflies

D．have colors that are not so bright

(4) When attacked by a bird, the resting butterfly sometimes would _____.

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A．fly away as quickly as possible

B．open its mouth to fight against the bird

C．close its wings and chase it away

D．open its wings and frighten it away

试题答案

答案：A;B;B;D