5 Act out a similar dialogue. Use the dialogue in Ex. 2 as a model. Student A: Your friend looks awful. Ask what the problem is, then tell him/her what to do. Student B: You have a headache. Tell your partner. Agree to do what he/she advises you to do.
My school is rather big – it is a five-storeyed building. The building is modern – it was built about ten years ago and everything is new here. There is also all necessary equipment in the gym and other classes. The canteen is very light and clean – it is on the first floor. My favorite subjects are History, English and Economics. My favorite teacher teaches History, she is also our form-mistress. To my mind, the best place in the school is a library. I like visiting library, we can also study here. It is very cozy and very-well organized thanks to out librarian. During the breaks I like to chat with my friends and discuss interesting events. In a few months I will have my final exams. I will miss my school very much.
Моя школа довольно большая – это пятиэтажное здание. Здание современное – оно было построено около 10 лет назад и здесь всё новое. Здесь также есть всё необходимое оборудование в спортзале и других кабинетах. Столовая очень светлая и чистая – она находится на первом этаже. Мои любимые предметы – это история, английский и экономика. Мой любимый учитель ведёт историю, также она наша классный руководитель. Как мне кажется, самое лучшее место в школе – это библиотека. Я люблю посещать библиотеку, также мы можем учиться здесь. Она очень уютная и хорошо организованная благодаря нашему библиотекарю. Во время перемен я люблю поболтать с друзьями или обсудить интересные события. Через несколько месяцев у меня будут выпускные экзамены. Я буду скучать за своей школой.
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.
Моя школа довольно большая – это пятиэтажное здание. Здание современное – оно было построено около 10 лет назад и здесь всё новое. Здесь также есть всё необходимое оборудование в спортзале и других кабинетах. Столовая очень светлая и чистая – она находится на первом этаже. Мои любимые предметы – это история, английский и экономика. Мой любимый учитель ведёт историю, также она наша классный руководитель. Как мне кажется, самое лучшее место в школе – это библиотека. Я люблю посещать библиотеку, также мы можем учиться здесь. Она очень уютная и хорошо организованная благодаря нашему библиотекарю. Во время перемен я люблю поболтать с друзьями или обсудить интересные события. Через несколько месяцев у меня будут выпускные экзамены. Я буду скучать за своей школой.
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.
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