高中英語(yǔ)unit5meetingyourancestors聽(tīng)力原文練習(xí)新人教版選修8-在線瀏覽
2025-01-22 18:10本頁(yè)面
【正文】 Part 1. Listen again and fill in the blanks. ZH: How can you tell how old bones are when you find them? RL: There are two main ways: the first uses the layers in the ground and the second uses radiocarbon dating. ZH: I see. How does the layer method work? RL: Well, look at the diagram in your book. Think of a wastepaper basket. When you came into work, you ate an orange and threw the orange skin into it. That’s layer number 1. Later somebody threw some yogurt pots into it. That’s layer number 2. ZH: Oh yes, and then I threw some paper into it. So that’s layer number 3. RL: Yes, and finally someone threw away some used envelopes. So how many layers are there in this wastepaper basket? ZH: There are four. RL: Which layer is the first and therefore the oldest? ZH: The orange skin. RL: And which is the last and therefore the most recent? ZH: Of course – the used envelopes. I see how it works now. But how does it help? RL: Well, layers of soil are produced at different times like the layers in your wastepaper basket. Each time people live somewhere, they make a layer in the soil. If they live there for a long time, they make a lot of layers. Each layer has a different colour and texture which we use to find out how old it is. ZH: How splendid! Listen to Part 2. Listen again and fill in the blanks. ZH: Now what about radiocarbon dating? RL: This
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