Why does the writer use the example of the Greek scientist who calculated the distance around the world? A. He wants to show the knowledge of ancient scientists. B. He wants to give an example of scientific knowledge which was available to early explorers. C. He wants to show that science has not been developing significantly. D. He wants to give an example of something which later scientists greatly improved.
答案是:B. He wants to give an example of scientific knowledge which was available to early explorers.
