animals and plants need water. Man also needs water. We need water to drink, to cook our food and to clean ourselves. Water is needed in offices, factories and schools. Water is needed everywhere.

There is water in seas, rivers and lakes. Water is found almost everywhere. Even in the desert part of the world, there is some water in the air. You can't see or feel it when it is a part of the air. The water in the seas, rivers and lakes is a liquid, the water in the air is a gas, and we call it water vapor (蒸汽).

Clouds are made of water. They may be made of very small drops of water. They may also be made of snow crystals(结晶体). Snow crystals are very small crystals of ice. Ice is frozen water. It is a solid. There can be snow and ice everywhere in winter.

Water may be a solid or a liquid or a gas. When it is a solid, it may be as hard as a stone. When it is a liquid, you can drink it. When it is a gas, you can not see or feel it.

4．Where can we find water?

A．We can find water when it turns into vapor. B．Water can be found almost everywhere.

C．We can find water in deserts here and there. D．Water is found only in seas and rivers.

5．Clouds are made of .

A．seas, rivers and lakes B．blocks of ice

C．solid, liquid and gas D．very small drops of water or snow crystals

6．Water has three states(状态) .

A．ice, snow and air B．solid, vapor, snow

C．solid, liquid and gas D．drops of water, blocks of ice and crystals of water

7．We can drink water when it is .

A．a liquid B．a solid C．in the air D．turned into ice

　　There are several ways from which to choose for you to keep your kids safe in your neighborhood. But the first step to keep your child safe in your neighborhood is to know your neighbors.

　　Knowing your neighbors can save you a lot of worry. It lets you know that the car that has just driven down the street belongs to "the yellow house on the corner", or the truck that has just driven by the playground looks unfamiliar, but the guy in the passenger seat resides two doors down. It's these simple things that keep you from going out of your mind whenever you see someone driving by where children are playing.

　　But you shouldn't just know what they look like. The next step is to know them well. What do they do? How do they act? You might be OK with them driving by the playground since they live in the neighborhood, but are you OK with them being on the playground? Knowing your neighbors solves several things. First you find out what kind of people they are. This helps you know if you should let your child go out in an area where they gather. Let us face it: you do not want your child to play around people or people's children that curse (咒骂) or hit each other. Sometimes you have to protect your child against your own neighbors.

Knowing them also makes them know you. Being neighbors is an interesting thing. You might not like them or have the same views as them, but we all usually protect those that we consider our own. If you know your neighbors, they know you. They are more likely to look after the child of the nice lady down the street in the brick (砖) house, than the people, in the house on the corner, who no one ever sees.