练习材料：Mr.James Scott has a garage in Silbury and now he has just bought another garage in Pinhurst. Pinhurst is only five miles from Silbury, but Mr. Scott cannot get a telephone for his new garage, so he has just bought twelve pigeons. Yesterday, a pigeon carried the first message from Pinhurst to Silbury. The bird covered the distance in three minutes. Up to now, Mr.Scott has sent a great many requests for spare parts and other urgent messages from one garage to the other. In this way, he has begun his own private 'telephone' service.
任务配置：L0+L1+L4
知识笔记：
pigeon n. 鸽子
message n. 信息
cover v. 越过
distance n. 距离
request n. 要求，请求
spare part 备件
service n. 业务，服务
练习感悟：Keep Moving！
