阅读下面短文,根据短文内容回答1~4题,并按要求完成第5题。

Do you know what are the world's tallest animals?

How do they sleep and drink?

You may think it's difficult for them to sleep, but they have no such problems because giraffes don't often stop for a snooze(打盹). As they are so tall-males can grow up to 18 feet, giraffes actually have the shortest sleep requirement of all mammals(哺乳动物) ,with an average(平均 ) of half an hour a day. When they sleep, they seldom lie down and sleep for minutes at a time, since it's difficult for them to get up again and it's dangerous in the wild. But the giraffe in the zoo sleeps around 4. 6 hours per day, mostly at night. It usually sleeps lying down

Drinking water may cause problems for the animals because their long necks are too short to reach the ground. To drink they must spread their legs in an uncomfortable position, which makes them easily hunted by other animals like Africa's big cats. As a result, they get most of their water from the plants that they eat. They only need to drink water every few days.

1.How long do giraffes living in the wild sleep every day?

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2.How does the giraffe in the zoo usually sleep?

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3.What must giraffes do to drink water?

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4.What's the main idea of the passage?

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5.请将画线句子翻译成汉语。

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Animals do many different, amazing things to get through the winter. Some of them migrate. They travel to other places where the weather is warmer or where they can find food.

Many birds migrate in autumn. Because the trip can be dangerous, some travel in large groups. For example, geese(鹅) fly in noisy, “V”-shaped groups. Other kinds of birds fly alone.

Some animals stay active in winter. They must change themselves as the weather changes. Many change their doing or their bodies. For example, snowshoe rabbits grow white fur to help them hide in the snow.

Food is hard to find in winter. Some animals, like mice, collect lots of food in autumn and store it to eat later. Some animals eat different kinds of food as the seasons change.

Some animals hibernate for part or all of the winter. This is a special, very deep sleep. The animal’s body temperature drops, and its heartbeat and breathing slow down. It uses very little energy. In autumn, these animals get ready for winter by eating much more food than in summer and storing it as body fat. They use this fat to keep them alive while hibernating.

Water makes good protection for many animals. When the weather gets cold, they move to the bottom of lakes and rivers. There, frogs and many fish hide under rocks or fallen leaves. Cold water holds more oxygen than warm water, and frogs can breathe through their skin.

Every type of insect has its own life cycle and that is the way it grows and changes. Different insects spend the winter in different forms of their lives. Some insects also spend the winter without moving. Some insects spend the winter as pupae(蛹). Other insects die after laying eggs in autumn. The eggs change into new insects in spring and everything begins all over again.

1. What does the underlined word “migrate” in the first paragraph most probably mean ?

A. move from one place to another B. sleep in the winter

C. disappear D. look for food

2. Why do many birds fly in large groups?

A. They can easily find food this way.

B. There may be danger during the trip.

C. They can get warm at night.

D. They will use little energy.

3. Snowshoe rabbits spend the cold winter by __________.

A. breathing through their skin

B. eating a lot of food

C. sleeping for the whole winter

D. growing white thicker fur

4. The main purpose of the examples in the last paragraph is to tell us ________.

A. most insects die when winter comes

B. different insects grow and change in their own ways

C. most insects spend the winter without moving

D. different insects grow and change in the same ways

5. What is the passage mainly about?

A. How living things grow and change in the winter.

B. How living things spend the winter.

C. How living things get food in the winter.

D. How living things travel in the winter.

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