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俗话说“鱼儿离不开水，花儿离不开阳光”。你看过或养过宠物鱼吗？你想了解它们的生活习性吗？你想知道如何饲养它们吗？请看——
Many people keep small fish as pets. They keep them in a tank1 of water. The tank is made of clear glass. People can look through it. They can see inside the tank and watch the fish.
The fish need room. The tank must be big enough. Fish need oxygen2 （O2） to breathe. They get it from the water in the tank. There must be enough water for all the fish. So the size of the tank is important.
Many people put small plants in the tank and those plants are good for the fish. They give oxygen to the water. Plants help in other ways， too. Fish can nibble3 on the plants. They hide among the plants and sleep.
The plants need light. Most fish need light too. The tank may be put near a window. It will get light there. A window may let cold air in. The water in the tank may get too cold. The fish may die because cold water can kill them. So can hot water. The temperature must be just right.
The fish must be kept in water all the time. Some fish can jump high. They may jump out of the tank. The tank should be covered. This keeps the fish from jumping out.
The fish need food every day. Giving them too much food is bad. The extra4 food will fall to the bottom and make the water dirty. However， the fish should get just enough food. They should finish the food in 10 minutes. When this happens， the amount5 of food is right.
Exercise：
I. Write“T” if the statement is true according to the passage and “F” if false.
1. Too little room is good for pet fish.
2. Small plants in the tank are good for pet fish.
3. We must keep pet fish in hot water.
4. We should give pet fish too much food.
II. Writing.
仔細观察你周围的植物或动物，结合你所学到的一些知识，写一篇80词左右的有关植物或动物的科普小短文。
Many people keep small fish as pets. They keep them in a tank1 of water. The tank is made of clear glass. People can look through it. They can see inside the tank and watch the fish.
The fish need room. The tank must be big enough. Fish need oxygen2 （O2） to breathe. They get it from the water in the tank. There must be enough water for all the fish. So the size of the tank is important.
Many people put small plants in the tank and those plants are good for the fish. They give oxygen to the water. Plants help in other ways， too. Fish can nibble3 on the plants. They hide among the plants and sleep.
The plants need light. Most fish need light too. The tank may be put near a window. It will get light there. A window may let cold air in. The water in the tank may get too cold. The fish may die because cold water can kill them. So can hot water. The temperature must be just right.
The fish must be kept in water all the time. Some fish can jump high. They may jump out of the tank. The tank should be covered. This keeps the fish from jumping out.
The fish need food every day. Giving them too much food is bad. The extra4 food will fall to the bottom and make the water dirty. However， the fish should get just enough food. They should finish the food in 10 minutes. When this happens， the amount5 of food is right.
Exercise：
I. Write“T” if the statement is true according to the passage and “F” if false.
1. Too little room is good for pet fish.
2. Small plants in the tank are good for pet fish.
3. We must keep pet fish in hot water.
4. We should give pet fish too much food.
II. Writing.
仔細观察你周围的植物或动物，结合你所学到的一些知识，写一篇80词左右的有关植物或动物的科普小短文。