Exhaust fumes are a threat to the _____________ to the air we breathe.
举一反三
- The car, at least as we know it, is on the way out, because its exhaust ______ a threat to the environment.
- We need air to __________. A: survive B: live C: breathe D: go
- Without the atmosphere，we could not breathe． A: the air around the earth B: the height of the mountains C: the water in the ocean D: the size of the cities
- In an engine with air inlet valve and exhaust valve on its cylinder heads the fresh air will enter into the cylinder （） and the gases exhaust （）， there being an adequate overlap between the inlet opening and the exhaust closing.
- The Earth is surrounded by an ocean of gases we call the atmosphere. The atmosphere is important because it contains the air most living things breathe. It also absorbs heat energy from the sun. It even recycles water by returning it back to the Earth as rain. Without the atmosphere, life as we know it could not exist on Earth. The atmosphere is important for the single reason that most living things need to breathe on Earth. A: Right B: Wrong C: Not mentioned