In 1996, 39 American children started a very interesting project (計劃)-the Green Tree Project. The students began the project by gathering walnuts (核桃) in autumn. The nuts were buried in cages in the school garden in mid-November. (1)In this way, the seeds (種子) could be kept cool and moist (潮濕) for several months before they started growing. In February, the seeds were dug up, so they could begin to sprout (發(fā)芽). Sprouted seeds were kept in fridges, so they could be stopped from growing until the time to plant. (2)This helped keep the trees about the same size at planting time. In March, sprouted seeds were planted in paper soft drink cups. Each student was asked to plant 12 trees. (3)Then the trees were carefully watered and watched. The first walnut trees began to appear in about a week… On April 29th, the trees were transplanted (移植) to the lake. (4)It took the children only 90 minutes to plant all the trees. It was so interesting to see a treeless area turn into a forest right before their eyes.
