题目

During times of trouble, Franklin Delano Roosevelt spoke from a small room without a fireplace in the White House basement to millions of Americans. In his calm and conversational manner, he reassured（使......恢复信心）the nation in the depths of the Great Depression（大萧条）and through a World War. Saul Bellow described his own experience of listening to President Roosevelt, hold the nation together, using only a radio and the power of his personality. I can recall walking eastward on the Chicago Midway... drivers had pulled over, parking bumper（保险杠） to bumper小亮同学非常喜欢观察思考生物现象．雨后的一天下午，他仔细地观察地上的蚯蚓，想到了一个问题：蚯蚓生活在土中，它们到底喜欢明亮还是喜欢黑暗？请你根据小亮的问题，提出假设并设计一个探究活动．（1）、假设：________（2）、探究方案（3）、预期结果：________．