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Birds belong to a class of warm blooded vertebrate animals with feather covered bodies. Next to the mammals, birds are the most important group of land-living vertebrates. All birds have feathers, although in some types, particularly those that can not fly, the normal structure of the feathers may be much modified and be downy, woolly, or straw like. The forelimbs of birds are modified into wings. The bony part of the tail, except in the very earliest fossil birds, is very short, and the visible tail is composed of feathers only. The teeth are absent except in some fossil forms. As in mammals-the only other group of warm blooded animal-the circulation is highly perfected so that there is no mixing of arterial and venous blood, but the arrangement of veins and arteries by which this is accomplished, is different in the two groups. Birds have keen hearing, although they have no external ears. The sense of sight also is very keen, but the sense of smell is weak or lacking, except in a small few vultures and other birds.

From the text we can conclude that both birds and mammals have ....

• Backbones

• Keen hearing

• keen sights

• downy feathers

Birds belong to a class of warm blooded vertebrate animals with feather covered bodies. Next to the mammals, birds are the most important group of land-living vertebrates. All birds have feathers, although in some types, particularly those that can not fly, the normal structure of the feathers may be much modified and be downy, woolly, or straw like. The forelimbs of birds are modified into wings. The bony part of the tail, except in the very earliest fossil birds, is very short, and the visible tail is composed of feathers only. The teeth are absent except in some fossil forms. As in mammals-the only other group of warm blooded animal-the circulation is highly perfected so that there is no mixing of arterial and venous blood, but the arrangement of veins and arteries by which this is accomplished, is different in the two groups. Birds have keen hearing, although they have no external ears. The sense of sight also is very keen, but the sense of smell is weak or lacking, except in a small few vultures and other birds.

Which of the following is NOT possessed by bird?

• Feathers

• Teeth

• ears

• Tails

Butterflies are a type of insect with large and often colorful wings. They start out as eggs. They lay their eggs on leaves. The eggs hatch into caterpillars with tabular body. The caterpillar eats leaves, beds, or flowers of plants.

When a caterpillar is full sized, it goes into another stage called chrysalis. Caterpillars attach themselves to something solid before becoming a chrysalis. The caterpillar inside the chrysalis changes into a butterfly. Some butterflies make the change in one week. Some others take years to change.

When the change is complete, the adult butterfly splits the chrysalis. The insect unfolds its wings and pumps blood and air into then. It spreads out the wings until they become dry and harder. The beautiful butterfly then flies to get nectar from flowers. Most butterflies live only for one or two weeks.

What is the text mostly about?

• Butterflies' life stages

• How a caterpillar lives

• How butterflies lay their eggs

• Physical characteristics of butterflies

Butterflies are a type of insect with large and often colorful wings. They start out as eggs. They lay their eggs on leaves. The eggs hatch into caterpillars with tabular body. The caterpillar eats leaves, beds, or flowers of plants.

When a caterpillar is full sized, it goes into another stage called chrysalis. Caterpillars attach themselves to something solid before becoming a chrysalis. The caterpillar inside the chrysalis changes into a butterfly. Some butterflies make the change in one week. Some others take years to change.

When the change is complete, the adult butterfly splits the chrysalis. The insect unfolds its wings and pumps blood and air into then. It spreads out the wings until they become dry and harder. The beautiful butterfly then flies to get nectar from flowers. Most butterflies live only for one or two weeks.

Why do butterflies fly to some flowers?

• To get nectar

• To pump blood

• To get some food

• To dry their wings

Butterflies are a type of insect with large and often colorful wings. They start out as eggs. They lay their eggs on leaves. The eggs hatch into caterpillars with tabular body. The caterpillar eats leaves, beds, or flowers of plants.

When a caterpillar is full sized, it goes into another stage called chrysalis. Caterpillars attach themselves to something solid before becoming a chrysalis. The caterpillar inside the chrysalis changes into a butterfly. Some butterflies make the change in one week. Some others take years to change.

When the change is complete, the adult butterfly splits the chrysalis. The insect unfolds its wings and pumps blood and air into then. It spreads out the wings until they become dry and harder. The beautiful butterfly then flies to get nectar from flowers. Most butterflies live only for one or two weeks.

Where does a caterpillar change into a butterfly?

• On the leaves

• Inside the chrysalis

• On the flower

• Inside the nectar