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Look at the four squares, A, B, C, and D, which indicate where the following sen
Look at the four squares, A, B, C, and D, which indicate where the following sen
游客
2024-01-02
23
管理
问题
Look at the four squares, A, B, C, and D, which indicate where the following sentence could be added to the passage. Where would the sentence best fit?
Although these scientists believed that the planet was very old, they had no means of determining its exact age.
In the past, there were a number of scientists who attempted to determine the age of Earth. In the eighteenth century, James Hutton recognized that time was an element in all geological processes. A He argued that geological changes did not happen in a short period of time as a result of catastrophe. Instead, processes that were still happening had caused them. B In the nineteenth century, Sir Charles Lyell studied the composition of rock layers. C He concluded that Earth had experienced several periods of mountain formation and erosion, which must have occurred over great lengths of geologic time. D Until modern dating methods were devised, geologists could only wonder whether Earth was many millions, or even billions of years old.
选项
A、
B、
C、
D、
答案
D
解析
The first clause of the added sentence, although these scientists believed that the planet was very-old, summarizes ideas in the previous sentences. The second clause, they had no means of determining its exact age, introduces the topic of exact age, which leads to modern dating methods in the following sentence.
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