25. Why did Lindesay explore the Great Wall during spring and autumn? A. To show his talent for exploration. B. To escape the terrible heat in summer. C. Because plenty of rubbish covered it D. Because he had to attend college in winter. 26. Which of the following can replace the underlined word "zigzags" in Para. 2? A. leads B. flies. C. winds. 27. What does the last but one paragraph want to tell us? D. ties. A. Rubbish should be classified. B. He wants to be a true Chinese. C. We have no time to repair the Great Wall. D. It's our duty to protect the environment. 28. What kind of person do you think Lindesay is? A. Brave and selfless. B. Honest and easy-going. C. Optimistic and confident. D. Helpful and good tempered.C