Question

对话填空

Man：Let’s say you are a geologist, and you want to investigate the geological history of a place．That is, how did geologists determine things like…How were the rocks(1)f________? Or was an area(2)o________ under water?

Woman：I’d start(3)w________ stratigraphy．

Man：Could you explain what this is to the class?

Woman：Well, stratigraphy is the description of strata(地层)in sedimentary rock．I guess that’s not so(4)c________, huh? OK, let’s say one of the investigations near a river, for example．Well,

over the(5)h________ of the area, every time the river(6)f________, it would deposit a layer of sediment all through with flood．Sometimes a bigger layer, sometimes a smaller,(7)d________ on the size of the flood．

Well, one layer gets deposited over another．(8)O________ these strata built up over(9)m________ of years．Stratigraphy is the study of these layers of deposited settlement．

Man：So does that mean if I examine each of these strata, I can(10)t________ how long ago each one is deposited?

Woman：Yes!

Answer 1

答案：
解析：

1．formed　2．once　3．with　4．clear　5．history　6．flooded　7．depending　8．Obviously　9．millions　10．tell