How to write the composition of Unit 3 of Chinese in the second volume of Grade Four?

There is a little turtle in my home. It's a little smaller than my fist. The beige hard shell is semi-arched. The little turtle's head is triangular, probably to reduce the resistance of water. Those small eyes are round and bright, very energetic, and there are two small nostrils at the front of the head, which is very interesting. Look again, the four calves are short and thick, covered with tiny scales and with five small claws at the end. By the way, there's that long, thin tail, dragging it behind. This is very interesting.

Usually, the little turtle lies quietly in the water, sticks its head out of the water, and looks very "quiet". But the slightest movement, even footsteps, it will find, and immediately retract its head, revealing only two small eyes and a face of alert. For a long time, it will shake its neck and try to stick its head out bit by bit. The little turtle is really vigilant

I don't think you will believe that this slow-moving and clumsy little guy can catch fish! But this is wrong.

Once, I fed a small turtle a few small crucian carp three or four centimeters long. Very funny, as soon as the little fish was put into the basin, its neck, which had just been retracted, came out again, and two small eyes stared at the little fish. I wonder: can it catch small fish? This little fish is very clever, but it ... didn't expect the little turtle to be smarter. It didn't make a move, just lay there quietly, waiting for the opportunity. A few small fish didn't expect that their natural enemies were close at hand and they were still playing in the shuttle. I held my breath and opened my eyes. Finally, a small fish swam to the little turtle. The little turtle cleverly caught up with it in a few steps, opened its mouth and bit the head of the little fish. The little fish only wagged its tail twice and stopped. The little turtle climbed several more steps until it thought it was "safe" before enjoying its delicious meal with confidence. I saw its neck stretched out hard, apparently swallowing small fish, and its two front legs were still swinging back and forth, as if exerting force. Look, how interesting!

However, if you disturb it while eating, it will immediately put down the food, put its head out of the water to "spy" it, and then continue its delicious meal. It can be seen that even when eating, the little turtle refused to relax his vigilance!

Anyone who knows a little about history knows "Oracle Bone Inscriptions". In Shang dynasty, people once dug holes in tortoise shells and then burned them on fire. When these holes burst into "Bu"-shaped lines, the fortune teller decided the good or bad luck, and then carved the prayer, result and divination date on an Oracle bone, which became "Oracle Bone Inscriptions". Nowadays, people have obtained a lot of valuable information from tortoise shells and animal bones unearthed in Yin Ruins.

Not only that, the meat of the tortoise is edible, and the tortoise shell can be used as medicine.

It seems that the little turtle is not only smart and lovely, but also an animal that is very beneficial to human beings!