15. The undersea world is very beautiful. Now more and more people want to dive in the water to find the secrets there. Scuba diving (潜水) is a kind of sport. It can take you into a wonderful undersea world.
(1)
Some are as large as a school bus. Many sea animals give out light in the dark and some have sharp teeth.
During the day, there is enough light. Here, under the sea, everything is blue and green. When fish swim nearby, you can catch them with your hands. When you have bottles of air on your back, you can stay in deep water for a long time. (2)
And you must be very careful when you dive in deep water.
(3)
It's cold, and it's dark, too. The deeper it is, the less sunlight there is. At about 3000 feet, there is no light at al. It is very dark in the sea. Many fishes have no eyes. Some have big eyes. (4)
Besides the cold and the darkness, deep-sea animals face a third danger — other animals.
Animals must find food to eat. Many animals eat plants. However, some animals eat meat. (5)
They need to find animals as food, and they have to try not to become other animals' meals.
A. A few have eyes on one side. B. However, you can't dive too deep. C. Many people go to dive in summer. D. The deep sea is not an easy place to live in. E. You will find many strange animals in the sea. F. This means these sea animals have two big jobs. |