The rules of the game
1. You play this sport outdoors with one, two or more players. You need to hit the ball in a small hole. You should not hit the ball in the water.
2. You can play this sport outside or inside with two or four players. You have to hit the ball over a net and the ball mustn't go out.
3. You usually do this sport outside (but it can be inside). You have to go round a track many times and be the firsrt one to go past the finish line. Sometimes you have to go round a country, for example, France.
4. You play this sport outside with two teams. You have to part the ball to other players with your foot and try to kick the ball into the goal. You mustn't touch the ball with your hands.
5. You play this sport outside with two teams. You have throw the ball to other players and take the ball over through other team's line. You can also get points by kicking the ball through two very high posts.
Plastics are non-metallic, synthetic, carbon-based materials. They can be moulded, shaped, or extruded into flexible sheets, films, or fibres. Plastics are synthetic polymers. Polymers consist of long-chain molecules made of large numbers of identical small molecules (monomers). The chemical nature of a plastic is defined by the monomer (repeating unit) that makes up the chain of the polymer. Polyethene is a polyolefin; its monomer unit is ethene (formerly called ethylene). Other categories are acrylics (such as polymethylmethacrylate), styrenes (such as polystyrene), vinys (such as polyvinyl chloride (PVC)), polyesters, polyurethanes, polyamides (such as nylons), polyethers, acetals, phenolics, cellulosics, and amino resins. The molecules can be either natural — like cellulose, wax, and natural rubber — or synthetic — in polyethene and nylon. In co-polymers, more than one monomer is used.The giant molecules of which polymers consist may be linear, branched, or cross-linked, depending on the plastic. Linear and branched molecules are thermoplastic (soften when heated), whereas cross-linked molecules are thermosetting (harden when heated).Most plastics are synthesized from organic chemicals or from natural gas or coal. Plastics are light-weight compared to metals and are good electrical insulators. The best insulators now are epoxy resins and teflon. Teflon or polytetrafluoroethene (PTFE) was first made in 1938 and was produced commercially in 1950.Plastics can be classified into several broad types.1. Thermoplastics soften on heating, then harden again when cooled. Thermoplastic molecules are also coiled and because of this they are flexible and easily stretched.Typical example of thermoplastics is polystyrene. Polystyrene resins are characterized by high resistance to chemical and mechanical stresses at low temperatures and by very low absorption of water. These properties make the polystyrenes especially suitable for radio-frequency insulation and for parts used at low temperatures in refrigerators and in airplanes. PET (polyethene terephthalate) is a transparent thermoplastic used for soft-drinks bottles. Thermoplastics are also viscoelastic, that is, they flow (creep) under stress. Examples are polythene, polystyrene andPVC.2. Thermosetting plastics (thermosets) do not soften when heated, and with strong heating they decompose. In most thermosets final cross-linking, which fixes the molecules, takes place after the plastic has already been formed.Thermosetting plastics have a higher density than thermoplastics. They are less flexible, more difficult to stretch, and are less subjected to creep. Examples of thermosetting plastics include urea-formaldehyde or polyurethane and epoxy resins, most polyesters, and phenolic polymers such as phenol-formaldehyde resin.3. Elastomers are similar to thermoplastics but have sufficient cross-linking between molecules to prevent stretching and creep.
Объяснение:
1.like 2. read. 3. lives. 4. does(тут не поняла,вроде так). speaks. 5. drive. 6. play. 7. sings. 8. haves. 9. gives. 10. go.
2.
1. Он встает в 7 часов утром.
2. Я хожу на Черное море каждый год.
3. Мэри живет в Италии.
4. Иногда мы смотрим телевизор вечером.
5. Твои друзья понимают французский?
6. Сэм работает в полиции.
3.
1. Is Kate his older sister? Kate is not (isn't ) his older sister.
2. Has my granny 5 grandchildren? My granny hasn't 5 grandchildren.
3. Do my parents go to the cineme every weekend? My parents don't go to the cinema every weekend.
4. Does Ann sleep? Ann doesn't sleep.
4.
1. We like to read... .
2. Ben haves .
3.
4. My friends eat... .