Crocodiles(鱷魚)lay their eggs and leave them under leaves or sand. Baby crocodiles have special sharp teeth with which to break their way out of the shells. Crocodiles only live where it is hot. They are found in India, Australia, Africa and America. They spend most of their time lying around in the mud or the rivers. The crocodiles long powerful tail is used when the animal is swimming. It is also an excellent weapon, because it can be swung with great speed and force. One blow will knock down a man or even a big animal at once. The crocodile is very well protected against its enemies by the hard bony plates which cover most of its body, but because of the way its neck is formed, it cannot turn its head from side to side and so it can only see in front of itself. The crocodile has its teeth cleaned by the crocodile bird. For its food this bird takes the bits left in the crocodiles mouth. This helps the crocodile, which cannot clean its own teeth, for it cannot move its tongue up and down. With its rows of terrible pointed teeth it seizes its food, which may be a fish, an animal, or even a careless human being, and then holds it below the water until it is drown to death. The long-nosed crocodile is shy and timid and because of this, the people of West Africa where it lives, sometimes catch it for food. Many, many centuries ago there were crocodiles in England. We know this because we have found their bones buried far down in the earth on which London is built. But the Britain of today is too cold for them to live in. Crocodiles may grow to over thirty feet in length. When they lie floating in the water, they look like floating tree-trunks and it is often impossible to tell that they are there.

The female crocodile______.

A．buries her eggs

B．sits on her eggs

C．carries her eggs

D．eats her eggs

Crocodiles(鱷魚)lay their eggs and leave them under leaves or sand. Baby crocodiles have special sharp teeth with which to break their way out of the shells. Crocodiles only live where it is hot. They are found in India, Australia, Africa and America. They spend most of their time lying around in the mud or the rivers. The crocodiles long powerful tail is used when the animal is swimming. It is also an excellent weapon, because it can be swung with great speed and force. One blow will knock down a man or even a big animal at once. The crocodile is very well protected against its enemies by the hard bony plates which cover most of its body, but because of the way its neck is formed, it cannot turn its head from side to side and so it can only see in front of itself. The crocodile has its teeth cleaned by the crocodile bird. For its food this bird takes the bits left in the crocodiles mouth. This helps the crocodile, which cannot clean its own teeth, for it cannot move its tongue up and down. With its rows of terrible pointed teeth it seizes its food, which may be a fish, an animal, or even a careless human being, and then holds it below the water until it is drown to death. The long-nosed crocodile is shy and timid and because of this, the people of West Africa where it lives, sometimes catch it for food. Many, many centuries ago there were crocodiles in England. We know this because we have found their bones buried far down in the earth on which London is built. But the Britain of today is too cold for them to live in. Crocodiles may grow to over thirty feet in length. When they lie floating in the water, they look like floating tree-trunks and it is often impossible to tell that they are there.

The female crocodile______.

A．buries her eggs

B．sits on her eggs

C．carries her eggs

D．eats her eggs

Passage Three

Did you know that a turtle can lay twelve eggs in one minute？ A large sea turtle lays around 150 eggs at a time. She lays all these eggs in just a few minutes.

Large sea turtles live in the warm seas of the world. Except for when they lay their eggs, they spend their whole lives in water. When it is time to lay their eggs, the females swim to land. They usually return to the place where they themselves were born. How they find their way back there is a mystery.

When they reach shore, the big, heavy turtles crawl slowly up to the high water mark. Using their flippers, they pull themselves along the sand. They struggle like mountain climbers to attain their goal. When they finally reach dry sand, they rest before beginning the difficult task of laying eggs.

The turtles lay the eggs in deep holes and cover them with warm sand. The sand protects the eggs from harm. Then the females leave them. After a few weeks, if you happened to be walking along the beach, you might see the sand begin to shake in one spot. Then you would see tidy black balls coming out of the sand. The tidy heads of baby turtles!

Baby turtles have a build-in sense of direction. As soon as they are hatched, they head for the water. Once the babies swim out to sea, they don't touch shore again until it is time for them to lay their own eggs.

41. The first sentence lets us know that this passage is about ______.

A. turtles

B. oceans

C. time

D. eggs

Crocodiles are not in England now because______.

A．they have all been killed

B．they are too dangerous

C．they are all hiding under the rivers

D．the weather do not suit them nowadays

Crocodiles are not in England now because______.

A．they have all been killed

B．they are all hiding under the rivers

C．they are too dangerous

D．the weather does not suit them

Just then he ______that the hen ______three eggs a day.

A. lied, lay

B. lied, laid

C. lay, laid

D, laid, lay

'd like to start with an explanation of a common misconception. Many people have heard that crocodiles eat their babies. Well, in fact they don't. What happens is that the mother crocodiles take all their newly hatched youngsters into their mouths in order to carry them to the safety of the water. The reason is that the female crocodile must leave the water in order to hatch her eggs. She goes to the beach and digs a hole approximately 10 inches deep. She then lays her eggs in the hole and covers them with soil, using her body and tail to pat down the earth. While she guards her nest during the day and night for about 12 weeks, the sun heats the soil and hardens it. Then, when the baby crocodiles hatch, they find it almost impossible to get out, and they begin yelping and croaking. The mother hears them and rips open the nest. Then she takes the young into a pouch of skin in her lower jaw, and carries them to the safety of the ocean water before she releases them.

What the speaker says is the common misconception about crocodile mothers？

A．That they leave the water.

B．That they dig a hole in the sand.

C．That they open their nests.

D．That they eat their babies.

eave their eggs to hatch on their own. The current theory about birds is that the earliest birds did just that when they were cold-blooded creatures living in warm places. However when they became warm-blooded creatures living in cold places they had to remain on the eggs to keep them warm. The process we call incubation. For this they needed a place--a nest. Very likely the first nests were just primitive depressions scrape into the ground. Even now many species still lay eggs in this sort of crude nests. In fact every spring a mother killdeer will lay her eggs in some pebbles along the edge of the parking lot just outside the buildings in the cities. Primitive nests on the ground were fine for some birds but other birds began to elevate their nests in branches perhaps to avoid predators. These early elevated nests were probably loose platform. nests, like a robin's nest.

What evolutionary change in birds led to nest building？

A．Their flying ability improved greatly.

B．They became warm-blooded.

C．They began to lay eggs.

D．They changed their migration patterns.