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Dolphins live their whole lives in water.But they are not fish.They are mammals （哺乳動物） that live in water.That's why a dolphin comes to the top of the water so often.It has to breathe air.A dolphin's nose isn't easy to be seen.It's just a small hole on top of its head.The hole is called a blowhole （噴水孔）.
    A dolphin comes up every half minute or so to breathe.It opens its blowhole and take in air.Then it closes its blowhole and dives under the water again.But a dolphin can stay under the water for six or seven minutes if it has to.It can hold its breath.
    A dolphin listens with two ears.It can hear all kinds of noises under water.It can hear small stones rolling.It can hear the sound that fish and other dolphins make.A dolphin's ears may be small，but its mouth is big.It has to be big.It holds almost one hundred teeth.These teeth are all the same shape and size.They are used for catching food，but not for chewing.A dolphin opens its big mouth and seizes a fish firmly between its two rows of teeth.Then it swallows the whole fish.
    A dolphin swims very fast.It is said that a dolphin swims faster than anything else in the water.So men are trying to study their skin and shape.They are learning ways to make boats go faster through the water.Most people believe that dolphins are very clever.Some scientists say they are cleverer than dogs.But dolphins are not all alike.Some are shy.Some like to show off.Some are clever.Some are a little slow to learn.Some are very friendly.Some like to be left alone.

（1）Do dolphins live on land most of the time？
No.
No.

（2）Why does a dolphin come to the top of water？
Because it comes to the top of water to breathe air.
Because it comes to the top of water to breathe air.

（3）How long can a dolphin stay under the water？
For six or seven minutes.
For six or seven minutes.

（4）What are the dolphin's teeth used for？
They are used for catching food.
They are used for catching food.

（5）What do you think of the dolphins？
They are clever and friendly.
They are clever and friendly.

【答案】No.；Because it comes to the top of water to breathe air.；For six or seven minutes.；They are used for catching food.；They are clever and friendly.
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發(fā)布：2024/4/20 14:35:0組卷：1引用：2難度：0.5
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