試題詳解

37 Around 200 million years ago, Earth was 18 degrees warmer than it is now. A new study found that plant-eating dinosaurs may have contributed to prehistoric global warming by releasing significant amounts of methane gas through their farts and burps. The gas traps heat and warms the atmosphere. It can be inferred that methane is _____.
(A) a dinosaur that eats plants
(B) a greenhouse gas
(C) a plant that dinosaurs cannot digest
(D) the highest natural air temperature ever recorded on Earth