In the bright sunshine, the West Lake is rippling with blue waves and shining with golden light. Beautiful scenery; Rainy weather, the mountains are misty in the drizzle.

13. Choosing item (a) of C. should be "also a reason for the unique color of the lake". According to the article, "this may be the function of the blue sky and the brown sand on the ground, which is why the lake here has neon colors." Item b "is to create a harmonious artistic conception of water and sky" is not appropriate, but mainly to set off the color beauty of Walden Lake water. In item D, personification is not used in this paper. )

14. Walden Lake is rich in colors. (1) First, write about the color changes in different places, from a distance to a close look, from the top of the mountain to the lake. Secondly, write the color of the lake under different weather conditions, and the color difference between sunny and stormy weather; Third, write about the color of the lake in different seasons, the difference between snow-covered and spring. (3 points)

15. Cannot be removed or replaced. "We" shows the author's praise and pride in his hometown and Walden Lake, and also shows the author's closeness and integration with nature. (2 points) The author first writes out the colors of all the lakes in Concord in order to compare them with the colors of Walden Lake, which shows that the color changes of Walden Lake are even more surprising. (2 points)