صوت مشترک

Listen the following passage and mark the correct answer to each of the questions. You listen twice The first time A greenhouse is a building made of glass, where you can grow flowers and vegetables that need a lot of warmth. Sunlight shines through the glass and warms the greenhouse while the glas…

Listen the following passage and mark the correct answer to each of the questions. You listen twice The first time A greenhouse is a building made of glass, where you can grow flowers and vegetables that need a lot of warmth. Sunlight shines through the glass and warms the greenhouse while the glass keeps the heat from escaping. The Earth is surrounded by a blanket of gases that acts just like a greenhouse. Factories, electric power plants and cars make a lot of new gases. These gases are trappi