학교에서 내어준 프린트 자료입니다. 해석과 어법상 틀린 부분과 왜 틀렸는지 설명 부탁드립니다.
다음 글의 밑줄친 부분 중, 어법상 틀린 것은 ?
plastic is a popular material that has many uses. probably not a day goes by in our lives ①without our using or touching a plastic product. plastic have many unique properties, ② which make them useful for special purposes. they resist the flow of electricity, they insulate against heat, they are light in weight, and they wear extremely well. plastic is such a good insulator that it is used to ③cover cropper wires in everyday household wiring. tools, such as screwdrivers, have plastic handles to provide insulation for the electrician, in case an electrical current ④is accidentally switched on . plastics made from organic compounds, such as ethene, can be incredibly strong. racing car bodies ⑤are made from plastic that has been reinforced with glass fiber.