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一、阅读下面的文字,完成1—3题。 生命与气候共同进化 你能想到吗?千百万年以来,地球的气候是由地球的两大生命王国——动物界与植物界的斗争所决定的。动物吸收氧气而呼出二氧化碳,植物则吸进二氧化碳而放出氧气。二氧化碳是温室气体,因此可以立即得出结论:动物能使地球升温,而植物则使地球降温。如果哪一方占上风,那么地球就会面临温室效应或又一次严寒期。 五亿多年前的“寒武纪大爆炸”时期,地球被各种各样的生物占领着,当时的土壤中到处都是把二氧化碳释放到空气中的节肢动物,使空气中的二氧化碳含量高达今天的20倍,当时的气候极其温暖。 但是,植物很快就进行了反击。化石显示,4.5亿年前,含有木质素的植物首次出现,木质素使
First, read the following text and complete the 1-3 questions. Life and Climate Co-evolution Can you think of it? For millions of years, the earth’s climate is determined by the planet’s two major kingdoms of life, the animal kingdom and the plant kingdom. Animals absorb oxygen and exhale carbon dioxide. Plants inhale carbon dioxide and release oxygen. Carbon dioxide is a greenhouse gas, so it can be immediately concluded that animals can warm the earth while plants cool the earth. If which side has the upper hand, then the Earth will face the greenhouse effect or another cold period. During the “Cambrian Big Bang” over 500 million years ago, the earth was occupied by various kinds of living creatures. At that time, the soil was full of arthropods that released carbon dioxide into the air, and the carbon dioxide content in the air was high. Today’s 20 times, the climate was extremely warm at the time. However, the plants quickly counterattacked. Fossil shows that 450 million years ago, plants containing lignin appeared for the first time, and lignin caused