【高校英語】共通テストの英文解釈 vol.1186≪2022年共通テスト第6問B≫本文内容第４段落

□--■--□--■--□--■--□--------------------------------------------◆ 　　　【高校英語】共通テストの英文解釈 vol.1186 　　　　　　　　≪2022年共通テスト第6問B≫　　　2022/5/2配信 ◆----------------------------------------□--■--□--■--□--■--□--■ 目次・・・■　問題　■　全文訳　■　解答・解説　■　語句　■　解答一覧 ━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━ 今回は2022年共通テスト第６問Ｂを解説します。 ■　問題 第６問 Ｂ　You are in a student group preparing a poster for a scientific presentation contest with the theme "What we should know in order to protect the environment." You have been using the following passage to create the poster. ┌―――――――――――――――――――――――――――――――――――┐ ｜　　　　　　　　　　　　[Recycling Plastic]　　　　　　　　　　　　　 ｜ ｜　　　　　　　　　 ――What You Need to Know――　　　　　　　　　　　｜ ｜　　　　　　　　　　　　　　　　　　　　　　　　　　　　　　　　　　　｜ ｜　The world is full of various types of plastic. Look around, and you ｜ ｜will see dozens of plastic items. Look closer and you will notice a 　｜ ｜recycling symbol on them. In Japan, you might have seen the first 　　｜ ｜symbol in Figure 1 below, but the United States and Europe have a more｜ ｜detailed classification. These recycling symbols look like a triangle ｜ ｜of chasing pointers, or sometimes a simple triangle with a number from｜ ｜one to seven inside. This system was started in 1998 by the Society of｜ ｜the Plastics Industry in the US, but since 2008 it has been 　　　　　｜ ｜administrated by an international standards organization, ASTM　　　　｜ ｜(American Society for Testing and Materials) International. Recycling ｜ ｜symbols provide important data about the chemical composition of　　　｜ ｜plastic used and its recyclability. However, a plastic recycling　　　｜ ｜symbol on an object does not always mean that the item can be 　　　　｜ ｜recycled. It only shows what type of plastic it is made from and that ｜ ｜it might be recyclable.　　　　　　　　　　　　　　　　　　　　　　　 ｜ ｜　　　　　　　　　　　　　　　　　　　　　　　　　　　　　　　　　　　｜ ｜　Figure 1. Plastic recycling symbols　　　　　　　　　　　　　　　　 ｜ ｜　　　　　　　　　　　　　　　　　　　　　　　　　　　　　　　　　　　｜ ｜　(図は省略します)　　　　　　　　　　　　　　　　　　　　　　　　　　｜ ｜　　　　　　　　　　　　　　　　　　　　　　　　　　　　　　　　　　　｜ ｜　So, what do these numbers mean? One group (numbers 2, 4, and 5) is　｜ ｜considered to be safe for the human body, while the other group 　　　｜ ｜(numbers 1, 3, 6, and 7) could be problematic in certain　　　　　　　｜ ｜circumstances. Let us look at the safer group first.　　　　　　　　　｜ ｜　High-density Polyethylene is a recycle-type 2 plastic and is　　　　｜ ｜commonly called HDPE. It is non-toxic and can be used in the human　　｜ ｜body for heart valves and artificial joints. It is strong and can be　｜ ｜used at temperatures as low as -40℃ and as high as 100℃. HDPE can be｜ ｜reused without any harm and is also suitable for beer-bottle cases, 　｜ ｜milk jugs, chairs and toys. Type 2 products can be recycled several 　｜ ｜times. Type 4 products are made from Low-density Polyethylene (LDPE). ｜ ｜They are safe to use and are flexible. LDPE is used for squeezable　　｜ ｜bottles, and bread wrapping. Currently, very little Type 4 plastic is ｜ ｜recycled. Polypropylene (PP), a Type 5 material, is the second-most 　｜ ｜widely produced plastic in the world. It is light, non-stretching, and｜ ｜has a high resistance to impact, heat, and freezing. It is suitable 　｜ ｜for furniture, food containers, and polymer banknotes such as the 　　｜ ｜Australian dollar. Only 3% of Type 5 is recycled.　　　　　　　　　　 ｜ ｜　Now let us look at the second group, Types 1, 3, 6, and 7. These are｜ ｜more challenging because of the chemicals they contain or the 　　　　｜ ｜difficulty in recycling them. Recycle-type 1 plastic is commonly known｜ ｜as PETE (Polyethylene Terephthalate), and is used mainly in food and　｜ ｜beverage containers. PETE containers ― or PET as it is often written ｜ ｜in Japan ― should only be used once as they are difficult to clean 　｜ ｜thoroughly. Also, they should not be heated above 70℃ as this can　　｜ ｜cause some containers to soften and change shape. Uncontaminated PETE ｜ ｜is easy to recycle and can be made into new containers, clothes, or 　｜ ｜carpets, but if PETE is contaminated with Polyvinyl Chloride (PVC), it｜ ｜can make it unrecyclable. PVC, Type 3, is thought to be one of the　　｜ ｜least recyclable plastics known. It should only be disposed of by 　　｜ ｜professionals and never set fire to at home or in the garden. Type 3　｜ ｜plastic is found in shower curtains, pipes, and flooring. Type 6, 　　｜ ｜Polystyrene (PS) or Styrofoam as it is often called, is hard to 　　　｜ ｜recycle and catches fire easily. However, it is cheap to produce and　｜ ｜lightweight. It is used for disposable drinking cups, instant noodle　｜ ｜containers, and other food packaging. ｜Type 7 plastics (acrylics,　　｜ ｜nylons, and polycarbonates) are difficult to recycle. Type 7 plastics ｜ ｜are often used in the manufacture of vehicle parts such as seats, 　　｜ ｜dashboards, and bumpers.　　　　　　　　　　　　　　　　　　　　　　　｜