题目内容

How Do Animals Catch Their ZZZ’s?

　　Different creatures have developed some pretty creative ways to get their rest and stay safe．The lizard(蜥蜴)likes to sleep at the far end of small branches hanging out over a pond or lake in the rain forest．If a snake tries to slither up the branch to eat it，it will shake the branch and knock the lizard off，and the lizard will fall safely into the water．Chameleons can change color to match their surroundings in order to hide even while sleeping．

　　Gorillas(大猩猩)like to sleep high in the trees．They build a new bed every night，sometimes taking up to half an hour to pile branches，twigs，and leaves into a comfortable bed．Birds also find it safe to sleep in the trees，but unless they have eggs or young chicks，they don’t use a nest．They just lock their feet around a branch and hang on．A special tendon(腱)in their legs is automatically tight when they are at rest，so they won’t let go and fall．

　　Dolphins live underwater，but must come to the surface to breathe．Scientists now believe that dolphins may sleep with only half their brain，while the other half stays awake to keep them safe and breathing．Seals also do this，lying on their sides on the surface of the water with one flipper underwater paddling to keep their noses above the surface．Some ducks may also have this ability，and actually sleep with one eye closed and one eye open．

(1)

How many animals are mentioned in this passage?

[　　]

A．

6．

B．

7．

C．

8．

D．

9．

(2)

How does a chameleon protect itself while sleeping?

[　　]

A．

By changing its body colors．

B．

By hanging out over a pond．

C．

By sleeping with half their brain．

D．

By making beds with branches．

(3)

Why will not birds fall when they are at rest?

[　　]

A．

They build nests and sleep in them．

B．

They fall asleep automatically．

C．

They have a loose tendon in their legs．

D．

They lock their feet around a branch．

(4)

What does the writer intend to tell us?

[　　]

A．

The cleverest animal is the gorilla because it can make beds．

B．

Differences in habitat could lead to different living habits．

C．

The ways animals catch their ZZZ’s are pretty much the same．

D．

In order to protect themselves most animals choose not to sleep．

答案：1．C;2．A;3．D;4．B;
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相关题目

Plants and animals usually do not live apart, as in many ways they are important to each other. Most green plants can make their own food. The food of other living things, even the food of meat-eating animals, comes directly or indirectly from green plants. For example, some people eat mutton (羊肉); mutton comes from a goat; the goats eat grass. These steps, or links, make up what is called a food chain. Without green plants, all other living things would in time die of starvation.

Plants help animals in other ways too. They furnish homes and shelter for many animals. Many birds, as you know, build their nests in trees. Deer and many other animals use bushes for shel­ter. And even man depends much upon plants for his shelter. Animals repay some of this debt by helping plants. You may be aware that many insects and some birds do important work for plants by pollinating (授粉) them. You must have also learned how animals often help plants by spreading seeds.

What is waste material for one of these kinds of life is often valuable substance for the other. For example, animals give off carbon dioxide gas when they breathe. When plants make food, they absorb this gas from the air, using the carbon and releasing some of the oxygen back into the air. The oxygen that is released, then, is again supplied to animals. Thus the cycle continues, ani­mals helping plants, and plants helping animals.

All plants and animals have their enemies. Insects eat plants; birds eat insects; other animals kill birds. But here too, animals such as birds and bats help the plants by destroying harmful in­sects. Many plants and animals are helpful to some living things but are harmful to others. Then there are other rules in nature that act as checks and balances. For example, if there are more animals in a certain area than there is food to support them, some of the animals must mi­grate or starve. In either case, the number of animals will be reduced until the balance between animals and the available food supply is restored.

These helps and hindrances (障碍) are constantly going on in the plant and animal world to achieve a balance. As long as one living thing is dependent on another, whenever the scales are tipped (使倾斜), nature takes steps to balance the scales again.

 (Note: Answer the questions or complete the statements in NO MORE THAN TEN WORDS.)

1.What does the author mean by saying “Plants and animals usually do not live apart”?

2.Besides providing food and shelter for animals, plants can also ______ to help animals to live.

3.“Checks and balances” refers to ______ in the world of animals and plants.

4.What will be the final result if some animals migrate or starve for lack of food?

 

Plants and animals usually do not live apart, as in many ways they are important to each other. Most green plants can make their own food. The food of other living things, even the food of meat-eating animals, comes directly or indirectly from green plants. For example, some people eat mutton (羊肉); mutton comes from a goat; the goats eat grass. These steps, or links, make up what is called a food chain. Without green plants, all other living things would in time die of starvation.

Plants help animals in other ways too. They furnish homes and shelter for many animals. Many birds, as you know, build their nests in trees. Deer and many other animals use bushes for shel­ter. And even man depends much upon plants for his shelter. Animals repay some of this debt by helping plants. You may be aware that many insects and some birds do important work for plants by pollinating (授粉) them. You must have also learned how animals often help plants by spreading seeds.

What is waste material for one of these kinds of life is often valuable substance for the other. For example, animals give off carbon dioxide gas when they breathe. When plants make food, they absorb this gas from the air, using the carbon and releasing some of the oxygen back into the air. The oxygen that is released, then, is again supplied to animals. Thus the cycle continues, ani­mals helping plants, and plants helping animals.

All plants and animals have their enemies. Insects eat plants; birds eat insects; other animals kill birds. But here too, animals such as birds and bats help the plants by destroying harmful in­sects. Many plants and animals are helpful to some living things but are harmful to others. Then there are other rules in nature that act as checks and balances. For example, if there are more animals in a certain area than there is food to support them, some of the animals must mi­grate or starve. In either case, the number of animals will be reduced until the balance between animals and the available food supply is restored.

These helps and hindrances (障碍) are constantly going on in the plant and animal world to achieve a balance. As long as one living thing is dependent on another, whenever the scales are tipped (使倾斜), nature takes steps to balance the scales again.

(Note: Answer the questions or complete the statements in NO MORE THAN TEN WORDS.)

81. What does the author mean by saying “Plants and animals usually do not live apart”?

82. Besides providing food and shelter for animals, plants can also ______ to help animals to live.

  

83. “Checks and balances” refers to ______ in the world of animals and plants.

84. What will be the final result if some animals migrate or starve for lack of food?

    

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