What is an ocean like?
Bubbles rise. Before your eyes is a world of color and beauty. There are colorful fish, coral (珊瑚), and other forms of ocean life. Its coral can be millions of years old. Its Earth’s largest environment—the ocean.
An ocean is a large body of salt water. Earth has five oceans that are all connected (连通). They cover more than 166 million square kilometers, or about one-third of the Earth. The Pacific Ocean is the largest. Millions of living things are found in Earth’s oceans. Almost all ocean life forms live in shallow (浅) waters that are 100 meters deep or less. Yet, most of the world’s oceans can be as deep as 1,500 meters or more. The bottom of the ocean is too cold and dark to support much life.
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Of all the animals in the ocean, the number of fish is the largest. Ocean animals have their own ways that help them live in their environment.
The ocean is a wild place. Animals live in a changing environment. Some small fish feed on plants, and large fish eat smaller fish. Still larger animals, such as sharks, rule the underwater animal world. So how do animals stay safe in this environment?
Some fish have special tails. Waving their bodies, they can swim quickly along the ocean floor. If a stingray (黄貂鱼) senses danger, in just a few seconds it will cover itself with some sand. Its skin is the same color as the sand. This camouflage is a way that the stingray and some other ocean animals stay safe under water.
【小题1】What do we know about the ocean according to the passage? _________| A．Most animals live near the bottom of the ocean. |
| B．The Pacific Ocean covers one-third of the Earth. |
| C．The ocean will become brighter as it gets deeper. |
| D．It is the largest home for many animals in the world. |
| A．What do ocean animals look like? |
| B．What do animals mainly live on? |
| C．How do animals live under water? |
| D．How do animals keep from danger? |
| A．Zebras run very fast to get away from large animals quickly. |
| B．Some butterflies have brown wings that just look like dry leaves. |
| C．Foxes will lie down and play dead when they meet larger animals. |
| D．Rabbits can dig and hide in many holes to keep from being caught. |
