练习材料：Lesson 13 The Greenwood Boys
The Greenwood Boys are a group of pop singers. At present, they are visiting all parts of the country. They will be arriving here tomorrow. They will be coming by train and most of the young people in the town will be meeting them at the station.Tomorrow evening they will be singing at the Workers' Club. The Greenwood Boys will be staying for five days. During this time, they will give five performances. As usual, the police will have a difficult time. They will be trying to keep order. It is always the same on these occasions.
任务配置：L0+L4
知识笔记：
all parts of the country全国各地
give five performances有五场演出
keep order维持秩序
练习感悟 ：好像适应这个难度了
